Difine electronegativily.

Bond formed between two unlike atoms with little electronegativily difference is generally ________.

Bond formed between two unlike atoms with little electronegativily difference is generally ________.

N and Cl have same electronegativily. Whereas hydrogen bonding is present in the molecules of NH_(3), it is absent at the sometime in HCl molecules. Explain.

Difine the cell.

Difine the environmental pollulant. What do you understand by an environmental pollution model ?

What is the significance of the terms-'isolated gaseous atom' and 'ground state' while difining the ionisation enthalpy and electron gain enthalpy? Hint: Requirements for comparison puroses.