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There are a lot:

  1. all 6 noble gases, elements in group 18: He, Ne, Ar, Kr, Xe, Rn,
  2. di-atomic gases of elements: N2, O2, F2, Cl2,
  3. tri-atomic gas: ozone O3
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Related Questions

What is the atomic mass 20 gas?

The atomic mass of an element is the average mass of an atom of that element. For a gas with an atomic mass of 20, it could be calcium (Ca). Calcium has an atomic number of 20 and an atomic mass of approximately 40.08 grams per mole.


What element has the atomic mass 20 and is also a gas?

Neon


What element has amu 20 and is a gas?

The element with an atomic mass unit (amu) of 20 and is a gas is Neon. Neon has an atomic number of 10 and is a noble gas found in the Earth's atmosphere.


What is the atomic mass of the element Ne?

Neon is a non meta element. Atomic mass of it is 20.


What is the atomic mass of Ne?

Neon is a non metal element. Atomic mass of it is 20.


What is the atomic mass of neno?

Neon is a non metal element. Atomic mass of it is 20.


The Atomic and mass number for calcium?

Calcium is a metal element. Atomic mass of it is 40.


What is the identity of the element that has an atomic mass of 40.078 amu?

The element with an atomic mass of 40.078 amu is calcium. Calcium has an atomic number of 20.


What has atomic mass 20 and is a gas?

Neon.


What is the atomic mass 20 and is a gas?

Neon


How is the atomic mass calculated for neon?

Neon is a non meta element. Atomic mass of it is 20. Atomic number of it is 10.


What is the atomic number and the mass number of an element with 20 atomic number and 23 mass number?

The element with atomic number 20 is calcium. The mass number 23 indicates the total number of protons and neutrons in the nucleus of the atom. Since the mass number is 23 and the atomic number is 20, the number of neutrons in this calcium atom would be 3 (23 - 20).