The removal of electrons from an atom become more difficult when we move from left to right of a period. Do you agree with this? Justify.

Account for the following: Atomic radius decreases from left to right in a period

The electronegativity of elements from left to right in a period of periodic table.

Light meters in photographic cameras make use of photoelectric effect. Red light however bright, cannot produce the emission of photoelectrons from a clean zinc sur face. But even a weak ultraviolet radiation can do. Do you agree with statement ? Why?

Triploblastic animals are more complex than diploblastic animals. Do you agree with this statement? Justify.

"Inter halogén compounds are. more reactive than the constituent halogen molecules" ' Do you agree with this' statement? Justify.

During a class room discussion a student said that sponges are more complex than cnidarians. Do you agree with him. Justify.

During class room discussion a student said that sponges are more complex than cnidarians. Do you agree with him. Justify,

Basicity of hydroxides of lanthanoids decreases along the period from left to right. Explain the reason.

The first ionisation enthalpies of second period elements generally increase from left to right along the period. Give reason for this general trend.