Question

Radio active isotope of Hydrogen has ..............number of neutrons.

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is B 2

Radioactive isotope of hydrogen is ${}_1^{3}H$

$\therefore A=3$(mass number)

$Z=1$(protons)

$A=Z+n$

$3=1+n$

$n=2$(Number of neutrons).