Question

which of the following statements is true about the elements labeled a and b? a - element a is a non - metal, and element b is a metal. b - element a forms a 2 - ion, and element b forms a 1+ ion. c - element a is a solid, and element b is a gas at room temperature. d - element a has two valence electrons, and element b has one valence electron.

Explanation:

Assuming A and B are on periodic - table regions. A is likely a non - metal in group 16 (forms 2 - ion) and B is likely an alkali metal (forms 1+ ion).

Answer:

B - Element A forms a 2 - ion, and element B forms a 1+ ion.