How many Groups is the modern periodic table divided into?
A. 2
B. 3
C. 7
D. 18

18

In chemistry, a group is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the f-block columns are not numbered.

Ibelieve it's celsius. hope this .

No. an alpha particle is a pair of protons and a pair of neutrons, i.e. a helium