Question

mental you predicted the existence of certain element named them as Eka silicon and Eka aluminium
¡) Name the element which are taken the place of least element
¡¡) Mention the groups and periods in modern periodic table
¡¡¡) classify them as metals non metals and metlloids
¡¡¡¡) Number of valency

Answer 1

1. Eka aluminium = gallium
Eka Silicon = germanium

2. gallian group 13 period 3
Germanium group 14 period 3

3. gallium is metal
Germanium is a metalloid

4. group 3 has valency 3 and group 4 have valency 4