First slide

Hydrogen

Question

The sum of proton, electrons and neutrons in the lightest isotope of hydrogen is

Very Easy

A

3
B

5
C

2
D

6

Solution

${}_{1}H^{1}$ has 1 nucleons (1 proton + 0 neutrons and one electron, so sum of these is 1 = 2 = 2.

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