Question

☆ 50 Points ☆

What is atomic mass ? and give the atomic mass of Helium.​

Answer 1

A property closely related to an atom's mass number is its atomic mass. The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu.

Helium-3, also written as 3He, is a light isotope of helium having 2 protons but only one neutron and an atomic mass of 3.

Answer 2

Answer:

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)

• Atomic Mass of Neon is 4 u

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✡ 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.

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