Remember that as atomic number increase, the number of protons increase too in the nucleus. This concentration of positive charge in the middle of an atom renders all the electrons come closer come the nucleus. Note that opposite charges attract (electrons are negative and protons space positive). Thus, the radius that the atom decreases since the electron cloud is much less spread out.

You are watching: An increase in atomic number is related to an increase in atomic mass because

As us go down the table, the variety of shells increase. Think the a coco truffle. Rather of simply 1 harder chocolate shell, as you go under the table, you might have 3 or an ext shells. Thickness of this shells and the addition of orbitals the come through it provides the radius also larger.


The increase in atom number causesf an increase in the solid positive fee of the nucleus. Thus, the positive charge increases due to the variety of positive protons enhancing in the nucleus.

The strong positive fee of the nucleus has a solid pull ~ above the negatively fee electron cloud. This reasons the atom"s radius come decrease in size as that is traction inward. However, the atom will never ever close in on chin or implode. The neutrons aid with this.

AS you across the periodic table the atom number increases, yet the atomic radius decreases.

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The atomic radius boosts as one goes under a group in the regular table because more electrons are about the atom and more neutons and also protons space present. As one goes across a period the atom radius decreases because more protons space in the atoms as one goes across the duration and the electrons room in the very same shell. Beam L. Hanson, PhD.

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