Question

If mass of protons and neutrons are doubled then percentage increase in atomic mass of Ne²⁰ will be :
a. 100
b. 90
c. 75
d. 80


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Answer 1

Answer

a) 100.

Explanation

${ne}^{20}$

e = 10

Number of protons = 10 = 10 amu

Number of neutrons = 10 = 10 amu

Total mass = (10 + 10)= 20 amu

Mass of the electron is negligible.

If the mass of the neutron is doubled, then the total mass = (10×2) + (10×2) = 40 amu.

Therefore, the % of the increase

$\frac{40 - 20}{20} \times 100 \\ \\ \frac{20}{20} \times 100 \\ \\ 1 \times 100 \\ \\ 100\%.$

hopefully its helped u dear :)

Answer 2

ne 20

e = 10

Number of protons = 10 = 10 amu

Number of neutrons = 10 = 10 amu

Total mass = (10 + 10)= 20 amu

Mass of the electron is negligible.

If the mass of the neutron is doubled, then the total mass = (10×2) + (10×2) = 40 amu.

Therefore, the % of the increase

$\frac{40 - 20}{20} \times 100 \\ \\ \frac{20}{20} \times 100 \\ \\ 1 \times 100 \\ \\ = 100\%$

may its helpful for you dear :)