Question

31) The mass of an electron is approximately 1/1836
times the mass of
A) 1/1H
B) 2/1H
c) 3/1H
D) 4/2He

Answer 1

Answer:

$(_{1} ^ {1}\textrm{H})$  is the correct choice that is option A.

Explanation:

An electron has $\frac{1}{1836}$ times the mass of a proton, but an equal and opposite negative charge.

Lets $_{A}^{Z}\textrm{X}$ is any element represented here.

Where $Z$ is the number of protons as well as its atomic number.

And

$A$ is the mass number which is the number of protons and neutrons in any atom.

Note: We know that Hydrogen $(_{1} ^ {1}\textrm{H})$ is devoid of neutron,so number of neutrons in a Hydrogen atom is zero.

Then

$(_{1} ^ {1}\textrm{H})$ is also a representation of single proton.

So $(_{1} ^ {1}\textrm{H})$ is the right choice that is option A.