Question

24/12Mg and 26/12Mg are symbols of two isotopes of magnesium. Compare the atoms of these isotops
with respect to :
i] the composition of their nuclei.
ü] their electronic configurations.
iii] give the reason why the two isotopes of magnesium have different mass numbers.​

Answer 1

Answer:

(i) composition of nuclei

24/12 mg

Protons = atomic number=12

neutrons = mass num- atomic num

= 24-12

= 12

26/12 mg

protons = 12

neutrons =26-12

= 14

ii) electronic configurations

=1s^2 2s^2 2p^6 3s^2

electronic Configuration of both the Isotops of mg is same as they have same num of electrons since their atomic num is equal.

iii) The two isotops of mg have diff.mass number because they have diff number of neutrons