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 answer is Fluorine!Argon, one of the noble gases.
The fluorine-19 isotope.
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.
He (helium) is the second element on the periodic table.
Physical and chemical properties of an element are things about the element. if its a liquid, solid, gas. what the pH is. what the atomic number and mass is..... stuff like that.
Xenon (Xe) is a nonmetalic gas. it has the atomic number of 54 with the atomic mass of 131.239.
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.
Fluorine is a gas with a mass number 19.