$_{12}^{24} M g a n d_{12}^{26} M g$ are symbols of two isotopes of magnesium.

(a) Compare the atoms of these isotopes with respect to :

(i) the composition of their nuclei.

(ii) their electronic configurations.

(b) Give reasons why teh two isotopes of magnesium ahve different mass numbers.

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Solution

1) 24Mg12 = protons = 12, Neutrons = 12
26Mg12 = prtons = 12, Neutrons = 14
2) Both have Same Electronic Configurations = 2,8,2
3)Isotopes are variations in the element that have different numbers of (neutral) neutrons. Because neutrons have no effect on charge, they have no effect on the electronic and bonding properties of the element, but affect the atomic weight

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Similar questions

₂₂Mg²⁴ and ₂₂Mg²⁶ are symbols of two isotops of magnesium.

A. Compare the atoms of these isotopes with respect to:

1) composition of their nuclei

2) there electronic configuration

B. Give reason why the two isotopes of magnesium have different mass numbers

Q. Give the reason why the two isotopes of magnesium have different mass numbers.

Q. Assertion :Magnesium has two isotopes

_{12}^{24} M g

and

_{12}^{26} M g

. According to which isotopes of magnesium have different mass numbers. Reason: Different mass number of isotopes is due to the difference in neutrons no.

In a periodic table the average atomic mass of magnesium is given as 24.312 u. The average value is based on their relative natural abundance on earth. The three isotopes and their masses are (23.98504u), (24.98584u) and (25.98259u). The natural abundance of is 78.99% by mass. Calculate the abundances of other two isotopes.