Question

Give reasons i) Two isotopes of magnesium have different mass number ​

Answer 1

Answer:

of protons) and 26 is the mass number. The number of neutrons will be 26−12=14. Therefore the number of neutrons in 2612Mg is 14. Since 2612Mg and 2412Mg have different numbers of neutrons, they will have different mass numbers.

Answer 2

Explanation:

We know that mass number is the sum of the number of Neutrons and Protons in an atom. We also know that different isotopes of different elements have the same number of Electrons and Protons but a different number of Neutrons. Since the number of Neutrons in different magnesium isotopes is different, the sum of their Protons and Neutrons is also different because there's a different number of Neutrons. Thus, its mass number will also be different.

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