Element X is a metal with a valency 2, Y is a non metal with a valency 3.

Element X is a metal with a valency 2. Element Y is a non - metal with a valency 3.

Elements with valency 1 are

A metal 'X' has valency 2 & a non - metal 'Y' has a valency 3. If 'Y' is a diatornic gas ,write an equation for the direct combination of X&Y to form a compound.

Study the following table in which positions of six elements A,B,C,D,E and F are shown as they are in the modern periodic table. On the basis of the above table, answer the following question : (i) Name the element which form only covalent compounds. (ii) Name the element which is a metal with valency three. (iii) Name the element which is a non-metal with valency three. (iv) Out of D and E, which is bigger in size and why ? (iv) Write the common name for the family to which the elements C and F belongs.

Name the following: Metal with valency 2.

Metals have …………...valency.

Match the atomic number 2, 4, 8, 15 & 19 with each of the following - i] A solid non-metal belonging to the third period. ii] A metal of valency 1. iiiA gaseous element with valency 2 iv] An element belong ing to Group 2. v] A rare gas.

Study the extract of the Periodic Table given below and answer the questions. Give the alphabet corresponding to the element in question. Do not repeat an element. State which element: Is non-metallic and has a valency of 2.

The valence electron in alkali metal is a

How are the elements with variable valency named ? Explain with an example.