Question

Which is the lightest among the following ? a)An atom of hydrogen b)An electron c)A neutron d)A proton e)Both b and c

Answer 1

Answer:

Both B and C

Explanation:

Weight of a hydrogen atom = 1

Weight of a neutron = 1.67 * 10⁻²⁷kg

Weight of an proton = 1.67 * 10⁻²⁷kg

So,

Both B and C

Answer 2

The lightest particle among all of them is b) An electron.

Explanation:

We need to go through the masses of all of these particles first:

• Mass of an electron: 9.11 x $10^{-31}$
• Mass of a proton: 1.67 x $10^{-27}$
• Mass of a neutron: 1.67 x $10^{-27}$
• Mass of a hydrogen atom: 1.67 x $10^{-27}$

• We can see that the mass of proton and neutron is equal and are much heavier than an electron.
• The mass of an electron is pretty less than theirs.
• The mass of hydrogen is an atom consisting of a proton and an electron, so the mass of this atom would be considered the same as that of a proton.
• This proves that an electron is lighter than a hydrogen atom.