element z is a neutral element and has 39 protons. what element is it and how many electrons does it have? (use the periodic table)
platinum – 78
yttrium – 39
argon – 18
there is not enough information given to determine.

Yttrium – 39

Explanation:

Since the element is neutral and has 39 protons s the atomic number of the element must be 39. Yttrium is the only element in the periodic table with atomic number 39.

Atomic number of an element is equal to the number of protons which is equal to the number of electrons. Since the element is neutral, the number of electrons in Yttrium is also 39.  

i believe the answer is three water molecules