How do atomic radius vary in a period and in a group? How do you explain the variation?
Answers
Atomic radius of the elements are generally decreased from left to right in time because on passing from left to right in a period the nuclear charge slowly grows by one unit and one atom is also combined in the particle carapace, by which the electrons get dragged more towards the nucleus.
As a result of the atomic radii limits.
The nuclear radius of the elements improves as we move downwards in a group because on moving down a group there will be an increase in the principal quantum number & thus, increase in the number of electrons shells. Hence, the tiny size is expected to grow."
Answer:
Atomic radius declines as we move from left to right in a period. It happens because in a period, the external electrons are available in a similar valence shell so, the atomic number increments from left to right in a period, which results in increase in the effective nuclear charge. Therefore, the attraction of electrons towards the nucleus is increased.
Also, atomic radius declines as we move from top to bottom in the group. It happens because as we move down in a group then there is increase in principal quantum number(n) which brings about increase in the distance between nucleus and the valence electrons.