CHO Group 17 (7A), the halogens, includes fluorine (F), chlorine (CI), bromine (Br), iodine (I), and astatine
(At). Which statement is MOST accurate concerning group 17 (7A) on the periodic table?
O They are metals.
They have 1 valence electron.
They are inert.
They are extremely reactive.

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.