Question

Select all the elements that are in the same period as calcium

potassium
magnesium
bromine
scandium

Answer 1

Calcium is in group IIA in the periodic table. A Ca ion has a charge of 2+. In order to solve this problem you can either see the periodic table or just look for the charge of the elemetns they give you.

K is group IA - charge of 2+

Magnesium IIA - charge 2+

Bromine VIIA charge of 1-

Scandium IB

The answer is B