Question

mass number of isotopes of magnesium is 24 and 26 and their atomic number is 12 then what is the composition of their nuclie

Answer 1

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Atomic number=no. of protons
here mass number= no. of protons+ no. of neutrons

So, In first case
mass number of magnesium is 24 and atomic number is 12 which means no. of protons=12
so no. of neutrons will also be 12.
12( no. of protons)+12(no. of neutrons)=24

In the second case
the same theory as above
no. of protons=12
mass no. =26
no. of neutrons=14

As we know the nucleus of an atom contains proton and neutrons.
So,
Case 1 : 12 protons and 12 neutons
Case 2: 12 protons and 14 neutrons

Here is ur ans.

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