The electronic configurtatons of three elements X, Y and Z are as follows:
$$\begin{array}{cc}X& 2,4\\ Y& 2,7\\ Z& 2,1\end{array}$$
(a) Which two elements will combine to form an ionic compound?
(b) Which two elements will react to form a covalent compound?
Give reasons for your choice.

Q. The electronic configurations of three elements X, Y and Z are as follows:

X	2, 4
Y	2, 7
Z	2, 1

(a) Which two elements will combine to form an ionic compound?
(b) Which two elements will react to form a covalent compound?
Give reasons for your choice.

Q. The electronic configurations of three elements A, B and C are as follows:

A	2, 8, 1
B	2, 8, 7
C	2, 4

(a) Which of these element is a metal?
(b) Which of these elements are non-metals?
(c) Which two elements will combine to form an ionic bond?
(d) Which two elements will combine to form a covalent bond?
(e) Which element will form an anion of valency 1?

Q. The electronic configurations of four elements A, B, C and D are as follows:

A	2, 8, 1
B	2, 8, 7
C	2, 8, 8
D	2, 4

(a) Which of these elements is a metal?
(b) Which of these elements are non-metals?
(c) Which two elements will combine to form an ionic bond?
(d) Which two elements will combine to form a covalent bond?
(e) Which element will form an anion of valency 1?
(f) Which element is a noble gas?

Q.

The elements A, B and C belong to groups 1, 14 and 17 respectively of the periodic table.

(a) Which two elements will form a covalent compound ?

(b) Which two elements will form an ionic compound ?

Q.

The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.

(i) Which two elements belong to the same group?

(ii) Which two elements belong to the same period?

Give reasons for your choice.