The element itself is Yttrium, which is a transition metal and not that reactive. Since it has 39 protons it will also have 39 electrons.
Answer:
14
Explanation:
if there is no number behind the element, it counts as one, but if there is, you do 1 times x(whatever the exponent is) and thats how many that one element counts for with atoms. then you just add them all up
Answer:

Explanation:
Number of molecules of water = 
= Avogadro's number = 
Number of moles is given by


The number of moles of water is
.
D. Protons, Atomic number is the number of protons in an atom.