Question

The common property amongst Be, Mg, Ca, Sr, Ba and Ra in the modern periodic table is:

• A. equal number of electrons
• B. equal number of electrons in the valence shell
• C. same number of shells
• D. all of the above

Answer 1

The correct option is B equal number of electrons in the valence shell

The elements in the modern periodic table are arranged in 18 vertical columns called groups and 7 horizontal rows called periods. Be, Mg, Ca, Sr, Ba and Ra belong to group-II of the modern periodic table. In the modern periodic table, all the elements of the same group have the same number of valence electrons.