Yes, it is.
Every decimal number can be represented by a binary number - and conversely.
If the number is represented by variable x, then twice the number is represented by 2x.
Not normally because an irrational number can't be expressed as a fraction which can be represented on the number line.
It can be represented as a ratio of two integers.
An unknown number represented by a letter or symbol is a variable.
Barium typically has an oxidation number of +2 in compounds.
0 in the elemental form, +3 in its compounds.
0 in elemental form +3 in its compounds
0 in elemental form, +3 in its compounds
0 in elemental form and +3 in its compounds
0 for the elemental form +2 in its compounds
0 in elemental form, +2 in all its compounds.
0 in elemental form, +1 in its compounds
0 in the elemental form, +3 in its compounds
0 in elemental form +1 in all its compounds
0 in elemental form +2 in its compounds
0 in elemental form, +2 and +4 in its compounds