Question

A radioactive substance ${}_{88}{X}^{228}$ (IIA) emits 3 α and 3 β particles to form 'Y '. To which group of long form of the periodic table does 'Y ' belong?

• A. IVA
• B. VA
• C. VIA
• D. VIIA

Answer 1

The correct option is D VIIA

Solution:

Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle and thereby transforms or 'decays' into a different atomic nucleus, with a mass number that is reduced by four and an atomic number that is reduced by two.

In beta decay Since a neutron is converted into a proton, the atomic number of the element will Increase by 1

So,

$X_{88}^{228}$ after $3\alpha decay$ $X_{82}^{216}$

$X_{82}^{216}$ after $3\beta decay$ $X_{85}^{216}$

Astatine is a chemical element with the symbol At and the atomic number $85$.

It is $p-$ block element with period $6$ and the group number is $17$ halogen groups.

Hence option D is the correct answer