Name the following:
An element having valency 'zero'.

Name the following: An element having highest electronegativitý.

Match the atomic number 2, 4, 8, 15 and 19 with the following: A gaseous element with valency 2.

Elements with valency 1 are

Name the following: Metal with valency 2.

Which of the following elements has only one valency?

Name the light element having three isotopes.

Which of the following element(s) have only one non-zero oxidation state.

Which of the following does not have valence electron in 3d-series ?

The correct statement from the following is A body having zero velocity will not necessarily have zero acceleration A body having zero velocity will necessarily have zero acceleration A body having uniform speed can have only uniform acceleration A body having non-uniform velocity will have zero acceleration

An element belongs to group 17 and period 3 of the periodic table. Write the following: The number of valence electrons in its atom.