15,999 Atomic weight of oxygen
The gas with atomic mass of 16 and has 8 neutrons is oxygen.
Helium with an atomic mass of 4.00260
There is no such noble gas with an atomic mass of 30. The mass of neon is 20 and the mass of the next noble gas, argon, is 40
Chlorine gas is Cl2. Cl's atomic mass is 35.45 and that x 2 is 70.9
15,999 Atomic weight of oxygen
The gas with atomic mass of 16 and has 8 neutrons is oxygen.
Helium with an atomic mass of 4.00260
Radon has atomic mass of 222. There is isotope of Radon with mass number 226. Radon is a Nobel gas.
Argon is a non meta element. Atomic mass of it is 40.
No halogen gas has a mass of under 15 atomic mass units. The closest is fluorine, at 19.0 atomic mass units.
Neon
Neon.
Oxygen - Atomic Mass: 15.9994.
Hydrogen is a gas. Mass number of it is 2.
There is no such noble gas with an atomic mass of 30. The mass of neon is 20 and the mass of the next noble gas, argon, is 40
Chlorine gas is Cl2. Cl's atomic mass is 35.45 and that x 2 is 70.9