A mystery element has 18 protons. Which one of the following statements is true about the element?
a.The element belongs in row 2 of the periodic table and is classified as a halogen.
b.The element belongs in row 3 of the periodic table and is classified as a noble gas.
c.The element belongs in row 4 of the periodic table and is classified as an alkali metal.
d.The element belongs in row 5 of the periodic table and is classified as an alkaline earth metal.