Question

which element has properties most similar to calcium (ca)?
a potassium (k)
b magnesium (mg)
c titanium (ti)
d rubidium (rb)

Explanation:

Elements in the same group (vertical column) of the periodic table have similar properties. Calcium (Ca) is in Group 2. Magnesium (Mg) is also in Group 2. Potassium (K) and rubidium (Rb) are in Group 1. Titanium (Ti) is in Group 4.

Answer:

B. magnesium (Mg)