Question

007 Give reasons for the following:
(a) Isotopes of an element are chemically similar.
(b) An atom is electrically neutral.
(c) Noble gases show least reactivity.
(d) Ions are more stable than atoms.
(e) Na+ has completely filled K and L shells.
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Answer 1

a) isotopes of elements are chemically as atomic number of isotopes is same which confers chemical properties to elements.

b) Noble gases have completely filled outer shell so they show least reactivity.

c) ions have noble gas configuration so they are more stable than atoms.

d) Na+ ( 2,8) sodium cation donates it's one valence electron to non-metals thus it has completely filled K(2) and L(8) shells

Answer 2

a) because electron arrangement is same

b)because it has filled valence shell of electron

c)because of electronic configuration of ions

d) by loosing one electron they get octet configuration