Question

a) A nucleus Na is B-radioactive

@) What are the numbers 24 and 11 called
(1) Write the equation representing beta - decay. What general name is given to the product nucleus with respect to11 24
Na ?​

Answer 1

Answer:

Generally a nucleus is represented as

Z

A

X where A= mass number and Z= proton number or atomic number.

Here, mass number A=24 and atomic number, Z=11 and the neutron number, N=A−Z=24−11=13

Answer 2

Answer:

(i)

11

24

Na →

12

24

Mg+

−1

0

e

(ii) 11 is the atomic number, 24 is the mass number.

(iii)

12

24

Mg and

11

24

Na are isobars, as they have the same mass number.

Isobars are the atoms of different elements which have the same mass number, but differ in their atomic number.