Name the two elements having valency 2?

Define magnetic susceptibility of a material. Name two elements one having positive susceptibility and other having negative susceptibility.

Noble gas elements has valency_____

Write down the characteristics of the elements having atomic number 17. Valency……………

Name (a) three elements that have a single electron in their outermost shells. (b) two elements that have two electrons in their outermost shells. (c) three elements with filled outermost shells.

Name two transition elements.

Name any two transition elements and any two inner transition elements.

Write down the characteristics of the elements having atomic number 17 . Electronic configuration ____________ period number _____________ Group number _______________ Element family __________ No . Of valence electrons ___________ valency ____________ metal or non - metal _______________