Question

35. Ionisation potential values of Li, Be and B are respectively in kJ mol-
1) 801, 899, 520 2) 520, 801, 899 3) 899, 801, 520
4) 520, 899, 801​

Answer 1

Answer:

option -2

Explanation:

520.3,899.5,800.7

Answer 2

Ionisation potential values of Li, Be and B are respectively in kJ/mol is 520, 899, 801.

• The amount of energy required to remove an electron is called ionisation potential.
• Li has one electron in the 2s orbital and can remove easily so, it has an ionisation potential of 520KJ/mol.
• Be has two electrons in the 2s orbital and can't remove easily so, it has an ionisation potential of 899KJ/mol.
• B has one electron in the 2p orbital but it has a small size and can't remove easily so, it has an ionisation potential of 801KJ/mol.
• Hence the correct option is 4.