The number of electrons in an element X is 15 and the number of neutrons is 16

• GC Atomic Structure

The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?

1. ³¹₁₅ X
2. ³¹₁₆ X
3. ¹⁶₁₅ X
4. ¹⁵₁₆ X

Answer

Number of electrons in element X = 15

Number of neutrons = 16

Atomic number = number of protons = number of electrons = 15

Mass number = number of protons + number of neutrons = 15 + 16 = 31

The correct option is A.