Question

Fill in the blanks:-
(a) Isotopes of an element have ........
(b) Number of valence electrons in cl- ion are ......
(c) electronic configuration of sodium ......

Answer 1

Answer:

A.Isotopes of an element have same atomic number but different mass number.

B.No of Valence electrons in Cl ion is 7.

C. 1s2 2s2 2p6 3s1 is the electronic configuration for sodium.

Answer 2

Answer:

a) Same atomic number but different atomic masses.

b)8valence electrons are there in cl- ion

c)electronic configuration of Na is

1s²2s²2p^63s¹

Hope it helps!

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