# Which group has the highest atomic radius?

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As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.

## Which group has lowest atomic radius?

Helium has the smallest atomic radius. This is due to trends in the periodic table, and the effective nuclear charge that holds the valence electrons close to the nucleus. Atomic radius decreases as you move across a period from left to right and decreases as you move up a group from bottom to top.

Thus O2− has a minimum z-effective thus largest radius.

## Which of the following have highest atomic radius?

Which of the following elements have the largest atomic radius? Solution: Option (c) is correct. Na has the largest atomic radius.

## How do you find atomic radius?

Atomic radius is determined as the distance between the nuclei of two identical atoms bonded together. The atomic radius of atoms generally decreases from left to right across a period. The atomic radius of atoms generally increases from top to bottom within a group.

## What is the largest atomic radius in Group 18?

The Electron Configurations for Noble Gases

Ar 18 71
Kr 36 88
Xe 54 108
Rn 86 120

## Which has a larger radius mg or CA?

Calcium has a larger atomic radius than Magnesium. If you look on the period table you will notice Magnesium atomic number is 12, while Calcium is 20. Calcium(Ca) has 4 energy level while magnesium(Mg) has 3 Energy level.

## Does CA or NI have a larger atomic radius?

Ca or Ni: the atomic radius of calcium is 194 pm while that of nickel is 149 pm.

211 pm

210 pm

## Why is the atomic radius of k larger than Br?

Since potassium is located at the start of period 3, and bromine at the end of the same period, potassium will have a larger atomic radius than bromine, and thus the largest atomic radius of the four given atoms.