Question

what is atomic mass of Helium?​

Answer 1

Answer:

The atomic mass of helium is. 4 amu.

Answer 2

Atomic Number = Number of protons

Atomic Mass = Number of protons + Number of neutrons

Atomic mass is the sum of number of protons and of neutrons.

Helium contains two protons and two neutrons in it.

So, it's atomic mass is

i.e.

=> 2 + 2

=> 4 u (amu)

$\textbf{Atomic Mass of Neon is 4 u}$

_____________________________

✡ More information :

• Atomic number of Helium is 2.

• It's symbol is He.

• It contains 10 electrons, protons and neutrons in it.

• It is colourless, odourless gas.

• It is a member of Noble gas.

• It is a non metal.

• It has the lowest melting and boiling point than other elements.

______________________________