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Periodic Table
The Periodic Table is a tabular arrangement of the elements in increasing order oftheir atomic numbers, so that elements with similar properties are in the same column. There are 18 columns, called groups, and seven rows, which are called periods, in the modern periodic table. Questions about the Periodic Table: its history and creation, trends, groups/families, and periods are asked in our Periodic Table category.
11,356 Questions
Why the pale blue liquid of N2O3 loses its colour on warming?
N2O3 is a pale blue solid. Above its melting point of -100 0C it dissociates
N2O3 <-> NO + NO2
At low temperatures the liquid is quite an intense blue but fades to a greenish colur due to the presence of NO2.
Brown monomeric NO2 is in equilibrium with its dimeric form colourless N2O4
Find the density of the nucleus of an iron atom with a radius of 3.555Fm and an atomic mass of 56?
To find the density of the nucleus, we first need to calculate the volume of the nucleus. The volume of a sphere is given by V = 4/3 * π * r^3, where r is the radius of the nucleus. Once we have the volume, we can divide the mass of the nucleus (which is equal to the atomic mass) by the volume to find the density. Density = mass / volume. Substituting the given values, we can calculate the density accordingly.
Why the elements are classified in to K L M N blocks and s p d f sub block?
The answers to both of these questions come from spectroscopy -- the study of how materials absorb or emit particular wavelengths of light.
When the lines in the spectrum of atoms were first connected with the electron structure, scientists did not know whether or not the highest energy lines they were seeing were from the innermost electron shell, or whether there were other shells with more tightly bound electrons. So they arbitrarily chose a letter from near the middle of the alphabet that would not be confused with a letter doing any other job. K was chosen. L, M, N, etc. then followed for the next shells moving outward, and scientists soon discovered that there was no J.
In the spectra of atomic elements, there were fairly obvious "series" of lines with different characteristic appearances, and a pattern to their wavelengths -- lines in a series getting rapidly closer together towards shorter wavelengths.
The characteristic appearances of the lines were described as "sharp", "principal", "diffuse", and "faint". The initials s,p,d,f were taken over to describe the subshells in the electron structure which produced these lines.
What are bridge elements in periodic table?
Bridge elements in the periodic table are transition metals that help to connect the main group elements. They typically have properties that are intermediate between the main group elements on either side of them. Examples of bridge elements include zinc, cadmium, and mercury.
Which metal occurs in native as well as combined form?
Most of the metals can occur in the native and combined forms.
What periodic elements are in sausages?
If this is a serious question, then the elements are many. They would include, in no particular order, carbon, hydrogen, oxygen, nitrogen, sulfur, phosphorus, sodium, potassium, chlorine, iron, magnesium, calcium.
If, on the other hand, it is a riddle, and you are talking about
SAuSAgEs,
then sulfur, gold, sulfur, silver, and einsteinium.
How can you get a negatively charged ion?
When atoms lose or gain electrons, they are called ions. As electrons are negatively charged, it is when they gain electrons that they become negative ions, if they lose electrons they become positive ions.
They can also form ions in pairs. for example
sodium atom (NA) gives up it's outer electron and becomes an NA+ ion.
the chlorine atom (CL) picks up the spare electron and becomes a CL- ion.
What two options do you use with the on commit clause when creating a global temporary table?
When creating a global temporary table, you can specify either "preserve rows" or "delete rows" with the ON COMMIT clause. "Preserve rows" keeps the data in the table after a commit, while "delete rows" removes the data in the table after a commit.
What is important of decay chain in isotopes?
In nuclear science, the decay chain refers to the radioactive decay of different discrete radioactive decay products as a chained series of transformations. Most radioactive elements do not decay directly to a stable state, but rather undergo a series of decays until eventually a stable isotope is reached.
Decay stages are referred to by their relationship to previous or subsequent stages. A parent isotope is one that undergoes decay to form a daughter isotope. The daughter isotope may be stable or it may decay to form a daughter isotope of its own. The daughter of a daughter isotope is sometimes called a granddaughter isotope.
How many elements are found next to each other on the periodic table?
Well, if we say that there are 117 elements, then at each end there is an element which is ony next to one other. So there would be 115 elements that are next to one each side. I don't know whether that answers your question, because I don't really understand what you are asking.
What is significance of the horizontal rows?
Horizontal rows in the periodic table are known as periods. They show the number of electron shells in an atom and indicate the energy levels of the elements. As you move from left to right across a period, the elements gain an electron in each succeeding element, filling up the electron shells.
How do to remember elements name down the group?
You can use memory aids such as mnemonics, acronyms, or visualization techniques to help remember the elements' names as you go down a group on the periodic table. Grouping elements with similar characteristics together can also make it easier to remember their names and properties. Practice and repetition are essential for reinforcing your memory of the elements' names in a particular group.
What is the element number of lithium?
The atomic number of lithium (Li) is 3. The atomic weight of Li is 6.941 amu, and the molar mass 6.941 grams per mole. See the Web Links to the left of this answer for a periodic table with more information about this element!
This period is known as incipient rebellion, where individuals come together to discuss issues, voice grievances, and initiate actions against authority. It marks the early stages of dissent and collective action.
Why the trend of electrode potential of group 1 is abnormal?
The trend of electrode potential in Group 1 elements is abnormal because the alkali metals in Group 1 have low ionization energies and thus readily lose electrons to form cations. This makes them highly reactive and their standard electrode potentials do not follow the expected trend based on their position in the periodic table. Additionally, the formation of stable oxides or hydroxides can also affect the electrode potential values.
How many protons and newtrons are there in16O8 and 56Fe26?
The atomic number of Oxygen is 8 and hence it has 8 protons and 8 electrons.
Oxygen has a mass number of 16. The number of neutrons is obtained my subtracting the number of protons from the mass number, i.e., 16-8 = 8. Therefore, Oxygen has 8 protons as well as 8 neutrons.
Now, Fe (Iron) is an interesting element. It has many isotopes. So, the exact number of neutrons is an estimated value. However, since the mass number has been given (56) we have to only determine the number of neutrons for this isotope of Iron. The number of protons is the same as the atomic number i.e., 26. The number of neutrons is obtained by subtracting the number of protons from the mass number , i.e., 56-26 = 30.
Therefore, according to the given data, Oxygen has 8 protons and 8 electrons. Iron has 26 protons and 30 neutrons.
What was the most important step in the development of the periodic table?
The most important step taken by Mendeleev in developing the periodic table of elements was the realization that chemical properties come in a repeating pattern, as elements get heavier. They go from metals to nonmetals to noble gases, and then back to metals.
Where can you get quotes using symbol of elements in periodic table?
You can find quotes using the symbols of elements from the periodic table by searching for them online in websites, social media platforms, or by looking for books or articles related to chemistry and science. There are also databases and forums where members share such quotes and information.
Why are nonmetal compounds gases at room temperature?
very few compounds of either metals or nonmetals are gasses at room temperature.
for example lets look at the oxides of semiconductors:
- carbon - CO2, gas
- silicon - SiO2, solid
- germanium - GeO2, solid
What are the elements in modern periodic table wherein symbols are taken from Scientists?
Many of the heavier elements are named after scientists. In order of their atomic number:
- 96 (Cm) Curium: named after Marie (Sklodowska) Curie.
- 99 (Es) Einsteinium: named after Albert Einstein.
- 100 (Fm) Fermium: named after the Italian physicist Enrico Fermi, one of the fathers of nuclear physics.
- 101 (Md) Mendelevium: named after Dmitri Mendeleev, creator of the periodic table. (The initially proposed symbol, Mv, was later discarded in favour of Md.)
- 102 (No) Nobelium: named after Alfred Nobel, inventor of dynamite and founder of the Nobel Prizes.
- 103 (Lr) Lawrencium: named after Ernest Lawrence, inventor of the cyclotron particle accelerator. The symbol chosen initially was Lw, but later the more popular Lr was officially recognised.
- 104 (Rf) Rutherfordium: named after Ernest Rutherford.
- 106 (Sg) Seaborgium: named after Glenn Seaborg.
- 107 (Bh) Bohrium: named after Niels Bohr.
- 109 (Mt) Meitnerium: named after the Austrian physicist Lise Meitner.
- 111 (Rg) Roentgenium: named after the German physicist Wilhelm Conrad Roentgen, discovered of the X-rays.
- 112 (Cn) Copernicium: named after Nicolaus Copernicus.
- 64 (Gd) Gadolinium: named after the mineral in which it was discovered, gadolinite, which in its turn was named after the Finnish chemist Johan Gadolin.
- 114 (Fl) Flerovium: named after the Russian scientist Georgy Flerov (or Flyorov,a s it is alternatively transliterated). (Officially, the element was named after the Flerov Laboratory of Nuclear Reactions, a Russian research institute which in its turn was named after the scientist who founded it.)
Additionally, some of the proposed (or provisional) names for some elements were derived from scientist:
- Element 104: one of the proposed names was kurchatovium (Ku), in honour of the Russian scientist Igor Kurchatov, former head of the Russian nuclear research.
- Element 105: one of its provisional names was joliotium, after the French physicist Frederic Joliot-Curie. (The name was originally proposed for element 102, later named nobelium.)
- Element 108: provisionally named hahnium (symbol Hn), after the Otto Hahn, "the father of nuclear chemistry".
What do you call vertical columns of element in the periodic table?
Vertical columns of elements in the periodic table are called groups or families. Elements within the same group have similar chemical properties due to their similar electron configurations.
How is a pure sample of carbon made?
A pure sample of carbon can be obtained by isolating it from carbon-containing compounds through processes like combustion, filtration, and purification. Examples include extracting carbon from graphite or by decomposing carbon dioxide to produce elemental carbon.
Which group in the periodic table have extremely reactive metals?
The group I metals (Lithium, Sodium, Potassium, etc.) are very well known for their extreme reactivity. These metals will tarnish quickly in air and can cause small detonations when thrown into water via a highly exothermic reaction that produces flammable hydrogen gas.
Does atomic radius increase from top to bottom in a group?
Yes, atomic radius generally increases from top to bottom within a group in the periodic table. This is due to the addition of more electron shells as you move down a group, causing the outermost electrons to be further from the nucleus.
What elements are included in group 8A of the periodic table?
Group 8A of the periodic table includes the noble gases: helium, neon, argon, krypton, xenon, and radon. These elements are characterized by their stability and unreactivity due to having a full valence shell of electrons.
