CBSE Class 9 Answered
(a) 
are symbols of two isotopes of Magnesium. Compare atoms of these isotopes with respect to
(i)Composition of their Nuclei
(ii)Electronic configuration and valency
(b)Give the reason why two isotopes of magnesium have different mass numbers.
are symbols of two isotopes of Magnesium. Compare atoms of these isotopes with respect to
(i)Composition of their Nuclei
(ii)Electronic configuration and valency
(b)Give the reason why two isotopes of magnesium have different mass numbers.
Asked by Topperlearning User | 04 Apr, 2016, 10:54: AM
Expert Answer
(a)(i) 
P = 12, N = Mass no. - P = 12
P = 12, N = 14
(ii) Electronic configuration: 2, 8, 2
Valency - 2
(b) Different mass numbers are due to presence of different number of neutrons in the two isotopes of Magnesium.
Answered by | 04 Apr, 2016, 12:54: PM
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