Which of the following has no true ?
a) Halogens are metals
b) ZnO is more basic than CO
c) A nonmetal is electronegative than a metal
d) A metal is more electrnegative than a nonmetal
What happens when an electron jumps from a lower energy level to higher energy level and when an electron comes down from a higher energy level to a lower energy level ?
a) Electron loses energy & electron gains energy respectively
b) Electron gains energy & electron loses energy respectively
c) Loses and gains energy simultaneously
d) Neither loses nor gains any energy