Why does the atomic radius usually increase with the increase in atomic numbers within a group?

Answer 1

the number of energy levels increases

Answer 2

The atomic radius increases with increasing atomic number within a group because each element in the group has an additional energy level of electrons as you move down the group. This results in a larger atomic radius due to increased distance between the nucleus and the outermost electron shell.

Answer 3

As you go down a group on the Periodic Table, atoms increase in size because additional electron shells are being occupied, which are further from the nucleus.

Due to the shielding effect from electron shells beneath the outermost shell (between it and the nucleus), there is an additional electron-to-electron repulsion factor that is included in the determination of the combined, effective attraction/repulsion of outermost electrons from the nucleus.

As such, as more electron shells are added, and more of a shielding effect is "felt" by outermost electrons, they move further from the nucleus in terms of relative position, and atomic radius increases.

Answer 4

The best reason that the atomic radius generally increases with atomic number in each group of elements is that the valence electrons are in a higher principle energy level so they sit farther away than the last energy level.

Answer 5

The atomic size is mostly determined by the outer electrons. As you go down the periodic table, atoms have more electrons and more energy levels.

As the (atomic number) increases (down the table), there is a corresponding increase in mass and volume (number of particles electrons, protons, neutrons). This requires a larger space to accommodate the increased volume of the atoms.

Answer 6

Atomic radius increases as you go down a group, which is a vertical column of the Periodic Table, because the number of electron shells increases.

As you go across a period from left to right, the filling of electron shells decreases the atomic radius until a shell is filled, so the radii are generally smallest to the right side of the period.

Answer 7

Both trends hold for both positive and negative ions.

Answer 8

When the valence level fills up, a new level is made a bit further from the nucleus. This trend on the periodic table increases as you go down the groups.

Answer 9

The sizes of the elements increase as you move down a group thus radii increase as well

Answer 10

the number of energy levels increases