If you mean element #9 in the table of the elements, that's fluorine.
9
Subtract the number of protons from the elemental mass number for the isotope of the element given to find the number of neutrons.
The type of element of a particular atom is based solely on its number of protons. An atom with 9 protons has an atomic number of 9, and is (looking on the elemental chart...) fluorine (F).
atomic mass or number?
Elemental Ar has an oxidation number of zero
Silver has 47 electrons in its elemental form. The number of electrons always equal to the atomic number of the atom in its elemental state.
0 in the elemental form
0 in the elemental form and +2 in its compounds
No -5 is larger numbers get larger farther right of the number scale
Zero. Se8 is th elemental form of selenium and oxidation numbers are not applied to elemental forms. Se8 is a ring and each selenium is bound to two others.
0 in the elemental form, +3 in its compounds.
The oxidation number of anything in elemental form is zero.