# What is uranium's group number?

Uranium is a member of the actinoids family; period 7, block f, no group number.

### What is the combining power of an atom in chemistry?

the combining power of a atom is, as i understand given by the group number. if the group number is 1-4 then the combining power is the group number. if group number is 5-8 then the combining power is 8 minus the group number. i.e: the group number of magnesium is 2 so the combining power is 2. the group number of oxygen is 6 so the combining power is 8-6=2.

### What is the relationship between the group number of the representative elements and the number of valence electrons?

If you are just looking at the main group elements, the group number would correspond perfectly to the number of valence electrons. However, upon including the other groups, the relation is. S-block: valence e- = group number. P-block: valence e- = group number - 10. D-block: valence e- = group number.