An element "X" belongs to group "15" and "2"nd period in the periodic table the atomic number of elements is

An element X belongs to group 14 and 2^(nd) period of the periodic table. Its atomic number will be

An element X belongs to group 17 and third period of the periodic table Write electronic configuration of the element. What is its valency?

An element belongs to group 15 and third period of the periodic table. Its electronic configuration will be

An element X belongs to group 17 and third period of the periodic table Give the formula of the compound formed when it combines with an element Y having valency three?

An element "Y" belong to\(1^{st}\) period and \(1^{st}\) group in Modern periodic table. Then atomic number of "Y" is....."