protons
It's outer valence electron shell(s).
No, the mass number of an element does not determine how a compound will form. The properties of compounds are determined by how the atoms of different elements are bonded together, which involves their electron configurations and interactions. The mass number only reflects the total number of protons and neutrons in the nucleus of an atom.
compound
No, argon is not a compound. It is an element classified as a noble gas, existing in its atomic form.
Oxygen is the element. It's a compound because the oxygen bonds with another element to form an oxide.
Neither. It is an element. Also, by definition if a substance is pure it cannot be a mixture; it mus either be an element or a compound.
ammonia and chlorine to form ammonium chlorine, 8NH3 + 3Cl2 ---> 6NH4Cl + N2
When you mix an element with a compound, a chemical reaction may occur. The element may react with the compound to form a new compound or may remain unchanged depending on the reactivity of the elements involved.
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No, it is an element but as such can form compounds.
compound
Calcium (Ca) is the element that may form a compound with CrO4 (chromate). The compound formed would be calcium chromate, CaCrO4.