The valence electrons are held closer towards the nucleus of the atom. One proton has a greater effect than one electron; thus, electrons are pulled towards the nucleus, resulting in a smaller radius. Atomic radius increases from top to bottom within a group. This is caused by electron shielding.
Q. Why we move from top to bottom in a group?
Answer. Explanation: when we move from top to bottom in a modern periodic table the atomic size increases because the number of electron and proton and neutron increased.
Q. Does atomic radius increase from top to bottom?
The atomic radius of atoms generally increases from top to bottom within a group. As the atomic number increases down a group, there is again an increase in the positive nuclear charge. As the atomic number increases within a period, the atomic radius decreases.
Q. How will atomic radius change as electrons are added to a shell?
The gain of an electron adds more electrons to the outermost shell which increases the radius because there are now more electrons further away from the nucleus and there are more electrons to pull towards the nucleus so the pull becomes slightly weaker than of the neutral atom and causes an increase in atomic radius.
Q. How do you think the atomic radii will change as electrons are added to a?
As electrons are added to the valence shell, an extra proton (i.e fundamental, positively charged nuclear particle) is added to the element’s nucleus. As electrons add and Z the atomic number increases 1 by 1, nuclear charge WINS, and electronic radii contract.
Q. Why does atomic radius change as you move down a group?
In general, atomic radius decreases across a period and increases down a group. Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital. This results in a larger atomic radius.
Q. What is the largest atomic radius in Group 18?
The Electron Configurations for Noble Gases
| Atomic # | Atomic radius (pm) | |
|---|---|---|
| Ar | 18 | 71 |
| Kr | 36 | 88 |
| Xe | 54 | 108 |
| Rn | 86 | 120 |
Q. Which is larger F 1 or F and why?
Cations have less electrons than anions. F-1 is larger than F because F has a greater positive charge and electrons repel the nucleus.
Q. Which is larger Cu+ or Cu2+?
Cu+ is larger than Cu2+. Cu2+ has a smaller cationic radius due to stronger hold of the nucleus on the remaining 27 electrons after the loss of two as compared to Cu+ where only one electron is lost and the hold of nucleus is less.
Q. Is BR bigger than GA?
Both elements are in the same group. Sn is down the group hence it is larger. For Br and Ga, Ga is leftmost relative to Br.
Q. What is the atomic radius of K+?
280 pm
Q. Which is larger AR or K+?
Explanation: And for NEUTRAL atoms, reasonably, atomic size decreases across a Period, from left to right as we face the Table, and INCREASES down a Group. With respect to the parent atoms, potassium would be larger than argon, the which would be smaller than chlorine.
Q. Is CL bigger than Ca2+?
Whichever has the highest proton/electron ratio would have the smallest nucleus. Therefore Ca2+ has the smallest nucleus while Cl- has the largest nucleus.
Q. Which is smaller in size Li or F?
Answer. Fluorine is in the same period as lithium but to the right of lithium so it’s smaller which means Li is larger in size than F.
