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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
What is the modification of John Dalton's atomic theory?
- All elements are made up of atoms
- Atomos are indivisible and indistructable
- Atoms of a given element are identical in mass and in all other properties
- A compound is formed when the atoms of two or more elements combine
In which group do the elements ussually orm oxides which have the general formula M2O3?
Group 3(III)
Oxides of
Group (I) are M2O
Group (II) are MO
Group(III) are M2O3
Group(IV) are MO2
Group(V) are M2O5 ( Can vary ; NO , N2O , NO2)
Group(VI) are MO3 ( Can Vary ; MO2 MO3)
Group(VII) are M2O7 ( Can Vary)
Group(VIII) are ther Noble (Inert) gases and do not react.
Transition metal/elements can exhibit variable oxidations from MO , M2O3, etcs.,
NB Group (V) , (VI), & (VII) have variable oxidation numbers and so can exhibit various oxides.
NNB 'M' is used to indicate an element , not just a metal .
BaO is the chemical formula for barium oxide, a white solid compound used in the production of ceramics, glass, and other materials. It is known for its high reactivity with water and acids, making it a useful material in various industrial processes.
A row on the periodic table is a horizontal arrangement of elements that share similar properties. These elements have the same number of electron shells. Each row represents one energy level or electron shell in an atom.
What happens to the size of atoms down group 1?
The atoms increase in size, because they gain more electron energy shells.
What period on the periodic table does cerium belong to?
Cerium belongs to lanthanoids. Its atomic number is 58.
Why are elements in the tall columns of the periodic table called representative elements?
They follow a pattern for valence electrons.
Trinitium is the name given to the active element of the Philosopher's Stone of Alchemists. It is a super-heavy element with atomic number Z = 126 and above since it appears to be kind of neutron condensate.
What is the formula and name for Rb O?
Rb is rubidium, O is oxygen. They will combine to form Rb2O which is called rubidium oxide.
What is CHO as a word formula?
It's not really possible to make that, but if it's a group on the end of a chain (eg CH3 CH2 CHO) then it's classed as an Aldehyde group.
If by CHO you mean a chain containing only Carbon, Hydrogen and Oxygen, then it's known as a Carbohydrate normally.
Why are the two bottom rows of the periodic table not attached to the rest of the table?
It's just a matter of convenient space in a rectangular piece of paper.
Have a look on the 'web' for 'Chemical Galaxy'. Each spoke of the galaxy is a Group, each ring of the Galaxy is a Period.
Pictorially , it is very beautiful, and probably more accurate arrangement of the elements.
In the modern Periodic Table ;-
#1 ; Groups are the columns down.
#2 ; Periods are the lines across.
In the periodic table what group is ignored?
The f-block, or inner transition metals, are sometimes ignored in the main body of the periodic table due to their size. These elements are typically placed below the main table to conserve space, but they are still part of the overall periodic table.
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.
