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 element Q ? (ii) Classify these elements as metals and non-metals.
(iii) Which of the elements will form the most basic oxide ?

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?

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?

Four elements A, B, C and D have atomic numbers 12, 13, 14 and 15 respectively. Answer the following questions giving reasons : (i) What is the number of valence electrons and valency of D? (ii) Which of them will have largest atomic radii ? (iii) Which of these elements will form the most basic oxide ?

Four elements A, B, C and D have atomic numbers 12, 13, 14 and 15 respectively. Answer the following questions giving reasons: (a) What is the number of valence electrons and valency of D? (b) Which of them will have largest atomic radii? (c ) Which of these elements will form the most basic oxide?

Elements P, Q, R and S have atomic numbers 11, 15, 17 and 18 respectively, Which of them are reactive non-metals?