Question

There are some vacant places in Mendeleev's periodic table. Enlist three of these predicted atomi masses along with their group and period​

Answer 1

Answer:

Medeleeve predicted the existence os some elements that had not been discovered at that time. Mendeleev named them by prefiixng a sanskrit numeral. Eka (one) to name of the preeciding element in the same group. For i atance scamdium, gallium and germanium, discovered later have similar to Eka boron, Eka aluminum, Eka silicon respectively. Having aromic masses 68,44,72 respectively.