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Q.

The representation of the element having 15 electrons and 16 neutrons is


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a

1531X

b

1516X

c

3115X

d

3116X 

answer is A.

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Detailed Solution

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The representation of the element having 15 electrons and 16 neutrons is 1531X.
An element having 15 electrons will also have 15 protons to maintain stability. The mass number is the sum of the number of protons and the number of neutrons.
Since the element has 16 neutrons, therefore the mass number of elements will be ⇒16+15=31.
 
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