State reasons for the following statements :
Q. State reasons for the following statements :
(i) Some elements possess fractional atomic mass.
(ii) Isotopes of an element have similar chemical properties.
(iii) Noble gases are inert.
Ans. (i) Some elements possess fractional atomic mass because they occur in nature in different isotopic forms. So, accordingly their average mass is calculated.
(ii) Isotopes of an element have similar chemical properties because they have same atomic number and valence electrons.
(iii) The outermost shell of the atoms of noble gases are completely filled up. So, they do not show affinity towards chemical reactions.
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