Classification ...

Arrange the elements in order of their reactivity?
B, Al, Ga, In

On moving left to right in a period, electron affinity of elements:

Which element has the largest electron affinity?

 In fluorine, incoming electrons are repelled by the

What is the name for the horizontal rows of the periodic table?

Write the electronic configuration of the element whose atomic charge and mass is 11 times and 23 times of the hydrogen.

In $$CuX_2$$, X belongs to which group?

Which element reacts most explosively in water?

Electronic configuration of  $$H^{ - }$$  is:

Elements whose atoms have three outermost shells incomplete are called?