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.