Question

(a)
An atom of an element X has 3 electrons in its third-shell.
0
State its electronic configuration
(10) State the number of protons in one atom of X.
(i) If the mass number of X is 27, how many neutrons are present in one
atom of x​

Answer 1

Answer:

2, 8, 3

proton = 13

mass number = no of proton + no of neutron

27 = 13+ no of neutron

no. of neutron = 27-13 = 14

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Answer 2

Answer:

It's electronic configuration would be (2, 8, 3).

The number of protons in one atom would be 13.

14 neutrons are present in one atom of X.

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