Fluorine is a non metal element. Atomic Mass number of it is 19.
Oxygen is a non metal element. Mass number of it is 16.
Fluorine is a non metal element. Mass number of it is 19.
The element with a mass number of 19 could be fluorine, which is a halogen and a gas, but not a noble gas.
The fluorine-19 isotope.
This gas is likely to be fluorine (F), which has a mass number of 19. Fluorine is a highly reactive, pale yellow gas that is part of the halogen group on the periodic table. It is commonly found in compounds rather than in its pure elemental form due to its high reactivity.
Gallium is a non metal element. Atomic Mass of it is 70.
Radon has atomic mass of 222. There is isotope of Radon with mass number 226. Radon is a Nobel 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.
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.
The element with an atomic mass of 35.453 grams is chlorine. It is a halogen gas with the chemical symbol Cl and atomic number 17.
Argon is a non metal element. Atomic mass of it is 40.
Atomic mass is the mass according to the number of protons and neutrons in the nucleus of the atom. The actual mass is the average of the masses of the different isotopes of the same element (alternative forms of the same element with the same no of protons but different no of neutrons) accordong to the isotopes mass and abundance in the world.