(a) Define covalent and ionic bond. [2 Marks]
(b) The table below gives some information regarding elements D, E, F, G and H.

(i) Will the compound formed by E and F have ionic or covalent type of bonding? [1 Mark]

(ii) Give the structure (electron dot diagram) of molecule $E_{2}$ . [1 Mark]

(iii) Identify the elements that can form ions having the electronic configuration of noble gas neon (atomic number 10). [1 Mark]

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Solution

(a) Ionic bond :The electrostatic bond or ionic bond formed between two different atoms (usually a metal or a non-metal), such that metallic atom donates all its electrons from the valence shell and the non-metallic atom/atoms accept these donated electrons, with the formation of cations and anions which mutually bind each other with e;lectrostactic force of attraction is called electrovalent bond or ionic bond. [ 1 Mark]

Covalent bond: A chemical bond formed between two non-metallic elements by sharing electron pair/pairs from the valence shells of reacting atoms, such that both the atoms acquire the electronic configuration of nearest noble gas is called molecular bond or covalent bond. [ 1 Mark]

(b)
(i) The compound formed by E and F will have an ionic type of bonding. As E is highly electronegative and F is highly electropositive. [1 Mark]

(ii) Element E have 7 electrons in its outermost shell so the valency or the combining capacity of element E is 1. Then the molecular structure of element E is:
[1 Mark]
(iii) Elements E and F can form ions with electronic configuration of neon.

electronic configuration of neon = 2, 8.
electronic configuration of $E^{-}$ = 2, 8.
electronic configuration of $F^{+}$ = 2, 8.
[1 Mark]

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Similar questions

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?

a) Complete the table below with the elements E,F,G,H such that E is an inert gas having electronic configuration 2,8.

Elements	Atomic number	Electronic configuration
E	Z	2,8
F	Z-1	______
G	Z+1	_______
H	Z+4	________

b) Which of the elements E, F, G, and H given in the above table will be a?

i) metal

ii) non-metal

iii) state the formula when

a) F and G combine

b)F and H combine

Complete the table below, with elements E, F, G, and H, such that element E is an inert gas having electronic configuration 2,8.

Elements	Atomic number	Electronic configuration
E	Z	2,8
F	Z-1	…………………
G	Z+1	…………………
H	Z+4	………………….

The electronic configurations of three elements A, B and C are as follows:
$\begin{matrix} A & 2, 8, 1 B & 2, 8, 7 C & 2, 4 \end{matrix}$

(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 tow elements will combine to form a covalent bond?
(e) Which element will form an anion of valency 1?

Q. Name the following:
i) A polar covalent compound formed from an element in period 1 and an element having electronic configuration 2, 7
ii) A non polar covalent compound formed from an element in period 1 and a non metallic element in group 14.
iii) The number of election shells in elements of period 3.

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