1.

(a) The elements are identified by their atomic numbers and not by their mass number. Justify the statement. (b) State the rules followed for writing the number of electrons in different energy levels.

Answer»

Solution :(a) Elements are characterlised by their atomic numbers, i.e.. the number of protons in the nucleus. The mass number of an element is the sum of the number of protons and neutrons.
Atoms of the same element may have diferent mass number but their atomic number remains the same. For example, chlorine has two types of atoms `""_(17)^(35)Cl and " "_(17)^(37)`Cl. Both have the same number of protons in their nuclei, but mass numberof protons in their nuclel. but mass number is DIFFERENT.
(b) The MAXIMUM number of electrons present in a shell is glven by the formula `2n^(2)`. Here, n is the ORBIT number or ENERGY level.
The maximum number of electrons that can be accommodated in the outermost orbit is 8.


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