Question

Calculate the number of electrons distributed in different orbits(shells) according to Bohr and Bury rules and find out valence electrons for different elements
Beryllium (Be)4
Oxygen (O)8
Silicon (Si)14
Chlorine (Cl)17
Which elements have a valency of 2?
(a)Be and Si
(b)Si and Cl
(c)Be and O
(d)Cl and O​

Answer 1

The two words are synonymous, so if you're looking for the number of atoms in an element, the answer is always one, and only one. Scientists know of 118 different elements, which they categorize in the periodic table, a diagram that arranges them in increasing order according to the number of protons in their nuclei.

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