The right hand side of the periodic table, which include element such as fluorine,Krypton and xenon represents non- metals element.
<u>Explanation</u>
6.02 x10^23 atom
3.5g x 1mol/63.55g Cu x 6.02 x 10^23/ 1mol=
3.32 x 10^22 atoms
Answer:
a) the atomic number is 15
b) the mass number is 15+16 = 31
c) element is phosphorus
d)Group 15 period 3