Selina Solutions Class 9 Chemistry Solutions for Exercise 4C in Chapter 4 - Chapter 4 Atomic Structure And Chemical Bonding
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\frac{24}{12} M g \text { and } \frac{26}{12} M g \text { 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 the two isotopes of magnesium have different mass numbers
Hence, composition of nuclei
12 \mathrm{Mg}^{24} \rightarrow\left[\begin{array}{cc} \mathrm{p} & \mathrm{n} \\ 12 & +12 \end{array}\right]+2^{\mathrm{Mg}^{26}} \quad,\left[\begin{array}{ccc} \mathrm{p} & \mathrm{n} \\ 12 & +14 \end{array}\right]
ii). Electronic configuration = 2, 8, 2
b) Mass numbers of isotopes of Magnesium are different because of the different number of neutrons, i.e. 12 and
14, respectively.
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