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ICSE Class 9 Chemistry Question 8 of 39

Atomic Structure and Chemical Bonding — Question 16

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Question

Question 16

Write down the electronic configuration of the following:

(a) 1327X

(b) 1735Y

Write down the number of electrons in X and neutrons in Y.

Answer

(a) electronic configuration of 1327X is [2, 8, 3]

(b) electronic configuration of 1735Y is [2, 8, 7]

Number of electrons in X = 13

Mass number of Y = 35 and number of protons in Y = 17

∴ Number of neutrons in Y = 35 - 17 = 18