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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**

Answer:

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.

"hello everyone welcome to leader
learning
i am gurpreet your science tutor today's
question is
2412 mg and 2612 mg
are the symbols of two isotopes of
magnesium
first a part that is compare the atoms
of these isotopes with respect to
composition of the nuclei
second their electronic configurations
and b part give reason why the two
isotopes of magnesium have different
mass numbers
right so let us discuss first the
composition that is the first part
here the two symbols have been given mg
1224 and mg
12 26 right
so here proton and electron will be
equals to the
atomic number that is 12 and here also
proton and electron that equals to
12 neutron here will be also 12
because 24 minus 12 is 12 only
and neutron here will be
26 minus 12 that is 40.
so this is the composition for the both
of the nucleis of
magnesium second the electronic
configuration
atomic numbers are say same in both
those cases
so its electronic configuration will be
2
8 2 this will be the electronic
configuration now the question is asking
the reason behind
the two isotopes of magnesium have
different mass numbers
because
here the neutrons
in both isotopes
isotopes are different
so the mass number is also
is different
right for more such videos please
subscribe leader learning
and for any doubts drop a comment thank
you
"

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