Question

Four elements A, B, C, and D have the following electronic configuration:​
A: 2, 6​
B: 2, 8, 8​
C: 2, 8, 8, 2​
D: 2, 7​

i. Which element is an inert gas?
ii. How many electrons should 'D' gain to achieve an octet electronic configuration?​
iii. What type of bond is formed when element C combines with element A?​
iv. What will be the formula of the compound formed between A and C?​

Answer 1

i. Element 'B' (electronic configuration: 2, 8) is an inert gas.
ii. 'D' should gain 1 electron to achieve an octet electronic configuration.
iii. Ionic bond is formed between element 'C' and element 'A'.
iv. $C_{2}A$ is the formula of the compound formed between A and C.