Question

Four elements A, B, C and D have the following electron arrangements in their atoms :
A 2, 8, 6
B 2, 8, 8
C 2, 8, 8, 1
D 2,1
(a) What type of bond is formed when element C combines with element D ?
(b) Which element is an inert gas ?
(c) What will be the formula of the compound between A and C ?

Lakhmir Singh Chemistry Class 10

Answer 1

Answer:

a) mettalic b) B c) AC2 will be correct formula

Answer 2

Explanation:

a) When element C combines with element D, an ionic bond is formed between the two by transfer of one electron from element C atom to element D atom

b) The inert gas is element B as it consist of eight electrons in its valence shell  which also means that it consists of a full valence shell

c) The formula of the compound between A and C will be AC2. Since element A needs two electrons to complete its octet, the two atoms of element C donate their two atoms to element A to stabilize.