If radium and chlorine combine to form radium chloride, the compound would be

Which one of the following nuclear reactions is not correct?

The end product of the $(4n + 1)$ radioactive disintegration series is:

Calculate the mass defect in the following nuclear reaction:
$_1H^2 + _1H^3 \to _2He^4 + _0n^1$
(Given: mass of $_1H^2 = 2.014 \ amu$,$_1H^3 = 3.016 \ amu$,$_2He^4 = 4.004 \ amu$,$_0n^1 = 1.008 \ amu$) (in $amu$)

Which of the following statements about radioactivity of an element is incorrect?

Radioactive isotopes that have an excessive neutron/proton ratio generally exhibit