the number of energy levels increases
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.
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.
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.
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.
Both trends hold for both positive and negative ions.
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.
The sizes of the elements increase as you move down a group thus radii increase as well
the number of energy levels increases
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Your question is incorrect. It should be increases rather than decreases. Well it is the proton number (Z) that increases.
Atomic radius increases down the group. This is because of the increase in number of shells.
An increase in atomic number would be accompanied by a decrease in radius, and an increase in electronegativity.
Decreases. Look at the images under atomic radius, on wikipedia.
They both increase
The negative ionic radius is larger than the neutral atomic radius
Atomic radius decreases horizontally in periodic table. This is due to increase in nuclear charge.
Your question is incorrect. It should be increases rather than decreases. Well it is the proton number (Z) that increases.
Atomic radius increases down the group. This is because of the increase in number of shells.
An increase in atomic number would be accompanied by a decrease in radius, and an increase in electronegativity.
The atomic radius increase down, from helium to radon.
Decreases. Look at the images under atomic radius, on wikipedia.
Atomic Mass
Yes
They both increase
decreases
This is because of the fact atomic radius is the distance of the outermost electron to the nucleus thus as more electrons are added the distance increase (which cause atomic radius to change)