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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 do elements in a group share similar properties?
all the members of a group of element have similar chemical properties because they all have the same number of electrons in their valence bands.The periodic table of elements is arranged this way,that is,by electron structure. The valence columns are the groups of elements , and is their electron structure that places them where they are.
It is supposed that bohrium has chemical properties similar to the properties of his homologue, rhenium. Only the compound BhO3Cl is known today. The predicted valences of bohrium are 7, 5, 4, 3.
Which part of the periodic table square tells you the number of protons and electrons?
The atomic number, which is located at the top of each element square in the periodic table, tells you the number of protons and electrons in an atom of that element.
What groups are the very reactive elements from?
The very reactive elements are typically found in Group 1 (alkali metals) and Group 17 (halogens) of the periodic table. Alkali metals tend to react violently with water, while halogens are known for their high reactivity and tendency to form salts with metals.
What is the total number of subatomic particles in one atom of scandium?
One atom of scandium typically contains a total of 45 subatomic particles - 21 protons, 24 neutrons, and 21 electrons.
How do you calculate density from molecular weight?
Density can be calculated from molecular weight using the formula density = (molecular weight) / (molar volume). Molar volume is the volume occupied by one mole of the substance and can be calculated using the ideal gas law or experimental data. Dividing the molecular weight by the molar volume gives the density of the substance.
What is another name for the f block elements?
They are also called Lanthanides and they are
Lanthanum, Cerium, Praesodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium
What 2 elements are found from Group 5a of periodic table in fertilizer?
Nitrogen and phosphorus are the two elements found from Group 5a of the periodic table that are commonly used in fertilizers for plant growth and development.
it was found in 1896. you can not find them on the periodic table. you may find some, but often some are.
Why is there no p block elements in the first period of the periodic table?
The first period of the periodic table can hold a maximum of 2 electrons, which are filled in the s orbital. There are no p orbitals in the first period, which is why there are no p-block elements in the first period. The p-orbital becomes available in the second period.
Why is iron placed on d block of the periodic table?
Iron is placed in the d-block of the periodic table because it has electrons filling up its d-orbital. The d-block elements are known for their variable oxidation states and reactivity, which is characteristic of transitional metals like iron.
What number is the whole number found in the periodic table?
There are two numbers that are included in every element's block on every periodic table. The whole number, which can range from 1 - 118 is the atomic number of that element. The atomic number is the number of protons in the nuclei of the atoms of that element. The second number is the atomic weight and is never a whole number, except for the artificially prepared elements, and then it is a whole number written inside parentheses.
There may be other numbers listed as well, depending on the periodic table. All periodic tables have a key as to what everything inside each block represents.
What does W on the periodic table mean?
"W" on the periodic table represents the element tungsten. Tungsten is a transition metal with the atomic number 74 and is known for its high melting point and strength. It is commonly used in various industrial applications, including light bulb filaments and electrical wiring.
What is the CO2 in periodic table of elements?
CO2 is not an element in the periodic table. It is a chemical compound composed of one carbon atom and two oxygen atoms. Carbon (C) is the 6th element and oxygen (O) is the 8th element in the periodic table.
What has the least mass in an atom?
The election within an atom would have the least mass. Protons and neutrons have a mass roughly that of 1amu, while an electron's is 1/1840 of an amu.
Neon
Neon, or Ne, has an atomic number of 10. Neon is a noble gas rarely found in the atmosphere. It is generally found in forming stars and in different areas of the universe.
Uses For Neon
- Neon lamps
- Neon advertising signs
- Cryogenic refrigeration
- Vacuum tubes
How does one recognize a periodic trend on the periodic table?
one should look for predictable changes and patterns
What the last element on each row of periodic table?
The last element in each row of the periodic table is as follows: Group 1 - Francium (Fr), Group 2 - Radium (Ra), Group 13 - Thallium (Tl), Group 14 - Lead (Pb), Group 15 - Bismuth (Bi), Group 16 - Polonium (Po), Group 17 - Astatine (At), and Group 18 - Radon (Rn).
Is the compound 2PbO2 balanced with the compounds of 2PbO plus O2?
The reaction is balanced since 2 moles of PbO2 yield 2 moles of PbO and 1 mole of O2. The law of conservation of mass is upheld with the same number of atoms of each element on both sides of the reaction.
What is the number of electrons in the highest occupied energy level of an element in Group 15?
The number of electrons in the highest occupied energy level of an element in Group 15 is 5. Group 15 elements have 5 valence electrons, which occupy the highest energy level.
Bromine, being in the second column from the rigth of the periodic table has a high electronegativity so when it forms compounds it tends to gain electrons, in other words, it is a nonmetal. While metals, which have low electronegativities tend to lose electrons
What element is in the halogen family and in the second period of the periodic table?
Fluorine is in the halogen family and in the second period of the periodic table.
How can you identify the elements in a family on the periodic table?
Elements in the same family on the periodic table have similar chemical properties and characteristics due to their shared number of valence electrons. They are located in the same column on the periodic table and have the same number of valence electrons, which influences their reactivity and bonding behavior. The main group elements in the periodic table are organized into families based on their electron configuration, with each family exhibiting similar properties.
What is the symbol for argent on the french periodic table?
the symbol for silver is "Ag" for "argent" on the French periodic table.
