Question

which member of each of the following pair of atoms / ions has larger radius and why 1) Br and Xe 2)Be and B 3)Na and Na+​

Answer 1

Answer:

Na is down in the same group as Li, its atomic radius is larger than Li. As Kr is next to Br in same period, its atomic radius will be lesser.

Answer 2

Member of each of the following pair of atoms/ions having larger radius are 1)Xe 2)Be 3)Na

• Between Br and Xe, Xenon has a larger radius than Bromine. Xenon is a noble gas. The radius of Xenon is known as Vander Waal's radius which is greater than the covalent radius of Bromine.
• Between Be and B, Beryllium has a larger radius than Boron because the effective nuclear charge dominates across the period. Due to the high effective nuclear charge, Boron has a smaller radius than Beryllium.
• Between Na and Na+, Na has a larger radius than Na+. Na is an atom while Na+ is a cation. Na+ being a cation has a smaller radius than Na because of the removal of an electron from its outermost orbit.