Question

An isotone of $^{76}_{32}Ge$ is

• A. $^{77}_{32}Ge$
• B. $^{77}_{33}As$
• C. $^{77}_{34}Se$
• D. $^{78}_{34}Se$

Answer 1

Answer: (B)

$^{77}_{33}As$

Answer 2

The correct answer is B:$^{77}_{33}As$
An isotone refers to two or more atoms that have the same number of neutrons but different numbers of protons and atomic numbers. They belong
to the same group but have the same neutron.
$Ge$, $As$ and $Se$ have the same number of neutrons that is 44, therefore they are isotones