Elements A, B and C have atomic numbers 9, 20 and 10 respectively.
State which one is :
(i) a non-metal
(ii) a metal
(iii) chemically inert.

Elements A, B and C have atomic numbers 9, 10 and 20 respectively. State which one is (i) a metal (ii) non-metal (iii) chemically inert. Explain the formation of bond between any two elements. Draw its orbital diagram. Name the type of bond.

Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Which one : forms an anion

Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Which one : forms a cation

Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Which one : has four electrons in the valency shell ?

Elements A, B and C have atomic numbers 9, 20 and 10 respectively. Write down the formula of the compound formed by two of the above elements.

Four elements P, Q, R and S have atomic numbers 12, 13, 14 and 15 respectively. Answer the following questions giving reasons: (i) What is the valency of Q ? (ii) Classify these elements as metals and non-metals. (iii) Which of these elements will form the most basic oxide?

The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belongs to the same group ?

There are three elements E, F, G with atomic numbers 19, 8 and 17 respectively. Classify the elements as metals and non metals.

There are three elements E, F, G with atomic numbers 19, 8 and 17 respectively. Classify the elements as metals and non- metals.

Elements A and B have atomic numbers 11 and 24 respectively. Write their electronic configuration and predict (a) group, (b) period, ( c) block to which they belong? Which of them is representative element?