4. 12Mg24 and 12Mg26 are symbols of two isotopes of magnesium. Compare atoms of these isotopes with
respect to
a) Composition of their nuclei; and
b) Their electronic configuration
c) Give the reason why the two isotopes of magnesium have different mass numbers.
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Answer:
a)12Mg24-12 protons
12 neutrons
12Mg26-12 protons
16 neutrons
b)2,8,2 (same for both)
c)Because they have different number of neutrons, which contribute to the increased mass but have no effect on charge.
Explanation:
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