Question

the number of neutron present in X atom is 2 and it's mass number is 12 calculate the number of protons and electrons​

Answer 1

Answer:

Mass number (A) = No. of protons (Z) + No. of neutrons

But the mass number is given as 31 and the number of protons is 15.

No. of protons (Z) + No. of neutrons = 31

Number of neutrons = 31 – number of protons

Number of neutrons = 31 – 15 = 16

Answer 2

Explanation:

First of all, the atomic mass of oxygen is 16u.

now to calculate the number of neutrons in 12 x 10 raised to the power 25 atoms of oxygen, calculate the number of neutrons in 1 atom of oxygen.

Number of neutrons = Atomic mass - Atomic number

so it is equal to (16 - 8) or simply 8

now multiply it with 6 x 10 raised to the power 23 to get the number of neutrons in one mole of oxygen.

Now multiply it with 2 x 10 raised to the power 2 to get the answer.

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