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Question

An element Y is made up of 15 electrons and 16 neutrons. Which of the following is the correct symbolic representation of the element?

A
3115Y
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B
1531Y
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C
1516Y
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D
1615Y
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Solution

The correct option is A 3115Y
An element X is symbolically represented as AZX, where 'Z' represents the atomic number and 'A' represents the mass number.

Atomic number = number of protons = number of electrons

Mass number = number of protons + number of neutrons

For the given element, atomic number is 15 and mass number is 31. Hence, it is represented as: 3115Y.

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