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Question

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

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Solution

1. Composition of their nuclei-
Nucleus of Mg-24 has 12 proton and 12 neutrons
nucleus of Mg-26 has 12prtoton and 14 neutrons

2. electronic configuration of both
k-2
l-8
m-2

3. the difference in the number of neutrons is the cause of magnesium have different mass numbers.

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