is the atomic mass of hydrogen
is the atomic mass of helium

2 amu

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1 amu

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4 amu

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3 amu

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Solution

The correct option is C 4 amu
The mass of an atom is measured in terms of atomic mass unit (1 amu).
1 amu is defined as the mass equal to one-twelfth (1/12th) of the mass of one carbon-12 atom.
The mass of C-12 atom is taken as the standard to measure the mass of other atoms.
Thus, the atomic mass of hydrogen is 1 amu and that of helium is 4 amu.

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Similar questions

Q. The relative atomic mass of hydrogen atom is:

The mass of a helium atom is twice that of the hydrogen atom

Choose the incorrect statement/statements from the following:

(i) Atomic mass of hydrogen is 1 u.
(ii) Atomic mass of helium is 2 u.
(iii) Atomic mass of chlorine is 17 u.
(iv) Atomic mass of phosphorous is 31 u.

can there exist an element with atomic mass 1.5 b/w hydrogen and helium ?

I

. The density of helium gas is

1 / 8

the density of oxygen gas.

I I

. The average atomic mass of helium is

4.00

and the average atomic mass of oxygen is

16.00

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is the atomic mass of hydrogen is the atomic mass of helium

is the atomic mass of hydrogen
is the atomic mass of helium