Answer:
10.5
Explanation:
half of a diameter is a radius, so you divide 21 by 2 to get your radius
21 divided by 2 is 10.5
Answer:
C
Explanation:
The two hydrogen atoms and one oxygen atom within water molecules form polar covalent bonds.
Water molecules do not have a net charge, but the polarity of water creates a slightly positive charge on hydrogen and a slightly negative charge on oxygen.
It explodes all over the place