For elements 1-20, we can use the periodic table to predict.

a) an elements color
b) the number of valence electrons an element has
c) the number of isotopes an element has.

B

Explanation:

because a periodic table shows the arrangement of element according to their atomic number and their valence neither

isotopes nor colour

B.

Explanation:

We can predict the number of valence electrons  by which group of the Periodic table an element resides.

For example Lithium is in group 1  and has 1 valency electron.

fdvwsa gfwsargebgeebbfwfwffw gwf   vgwgw gw f gwgw fgw v v dsv dwfff

no, the red giant is the hottest with 2.00.000.000 degrees celsius. while the white dwarf only 25,000 degrees celsius.