Which elements are likely to have similar properties to calcium because they have the same number of valence electrons as calcium

The correct answer would be - strontium, magnesium, beryllium.

Explanation:

As we know that the number of the same valence electrons is most likely to exhibit similar physical and chemical properties so the elements of the particular group in the periodic table have a similar number of physical and chemical properties and a similar number of the valence electrons.

For example, group 2 elements are known as alkaline earth metals, and strontium, magnesium, beryllium, and calcium are the same group elements thus, they have the same chemical and physical properties as they have 2 valence electrons.

nucleus

would be most reasonable answer tbh