# Atomic Radius Calculator

*Created by Team y2calculate.com*

Content written by Jangir khan (Ph.D.)

Calculator code by Marcelino

Reviewed by Hezbollah (Ph.D.)

Fact checked 🔍✓

#### Table of Contents

The atomic radius calculator is used to find the radius of the atom, just enter the Atom or element name and the total number of shells in the atom, the atomic radius calculator will calculate the radius of the atom.

let’s say you want to calculate the radius of 1st shell, simply take the square of the radius and multiply it by 0.529 Å, and you will get the atomic radius of that element or aton and so on.

## Atomic radius?

Atomic radius is the distance from the nucleus to to outermost shell. The atomic radius is like measuring how big an atom is. It’s half the distance between the centers of two atoms that are stuck together and are the same type. Since the boundary of an atom is not precisely defined, the concept of atomic radius is somewhat fuzzy and can depend on the method used to measure it.

There are a few common methods to determine atomic radius:

**Covalent Radius:**This is typically used for nonmetals. It is defined as half the distance between the nuclei of two identical atoms when they are joined by a single covalent bond.**Van der Waals Radius:**This is used for noble gases and some other nonmetals. It represents the radius of an atom when it forms weak attractions with other atoms.**Metallic Radius:**This is used for metals. It is defined as half the distance between the nuclei of two adjacent metal atoms in a crystal lattice.**Ionic Radius:**This is used for ions. It is the radius of an ion, which can be larger or smaller than the atomic radius depending on whether the ion is positive (cation) or negative (anion).

In general, atomic radius tends to increase as you move down a column in the periodic table (going from top to bottom) because the outermost electrons are in higher energy levels. Atomic radius tends to decrease as you move across a row (going from left to right) because the increasing positive charge in the nucleus attracts the electrons more strongly, pulling them closer to the nucleus.

It’s important to note that the atomic radius is an average value and may vary depending on the specific circumstances or the method used for measurement.

## Formula for calculating atomic radius

The formula for calculating the atomic radius of an atom is given by:

**Atomic Radius** = **Number of Shells**^{2} × 0.529 Å

In this formula:

**Atomic Radius:**The size of the atom, measured in angstroms (Å).**Number of Shells:**The total number of electron shells or energy levels in the atom.

The constant **0.529 Å** is a conversion factor used to express the atomic radius in angstroms, a common unit for atomic sizes. The square of the number of shells is multiplied by this conversion factor to determine the atomic radius.

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