Elements A, B and C have following relations. B is in the same group as A and B's period number is larger than A's. C is in the same
period as B and C's atomic number is less than B's. The relation of
their atomic radii is:
a A b c CB d B e A

Long term exposure to waves can cause sunburns and skin cancer. a) visible b) infrared c) gamma rays d) ultraviole

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Define a is a tiny pavket of energy