Question

What do all group 2 elements have in common? (2 points) they all gain two electrons to form a stable outer energy level. They form convalent bonds with halogens. They all react easily with the noble gases. They tend to form ionic bonds by losing electrons

Answer 1

Answer: Option (d) is the correct answer.

Explanation:

Group 2 elements are also known as alkaline earth metals and they are rich in electrons.

For example, calcium is a group 2 element with atomic number 20 and its electronic configuration is 2, 8, 2. In order to gain stability, calcium loses to electrons and becomes $Ca^{2+}$ ion.

Similarly, all the elements of group 2 donates electrons in order to form ionic bonds.

Hence, we can conclude that all group 2 elements have in common that they tend to form ionic bonds by losing electrons.

Answer 2

The correct answer would be the last option.  The property that is common to all group 2 elements is that they  tend to form ionic bonds by losing electrons making these atoms positive charge. They are called cations. These elements are beryllium, magnesium, calcium, strontium, and radium.