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Question

If 2512A and 4018B are two elements, which of the following are correct about them?

A
Mass number of A is 25
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B
Mass number of A is 12
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C
Mass number of B is 40
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D
Atomic number of B is 18
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Solution

The correct options are
A Mass number of A is 25
C Mass number of B is 40
D Atomic number of B is 18

An element X is represented as AZX, where 'Z' is the atomic number and 'A' is the mass number. So, for the given options -
ElementAtomic no.Atomic mass no.A 1225B1840


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