# Which elements have the smallest atomic radius?

## Which elements have the smallest 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.

What element in Period 2 has the largest atomic radius?

Answer: In the second period of modern periodic table Lithium (Li) is the element with largest atomic radius.

What element has the biggest atomic radius?

francium
Atomic radii vary in a predictable way across the periodic table. 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 element of the third period has the largest atomic radius?

Francium
Hint: Atomic size or atomic radius is the distance from the nucleus to the outermost electrons. It is found that Helium is the smallest element and Francium is the largest element.

So, in the end, we can conclude that nickel ions have a minimum radius.

Why K+ is larger than Na+?

K+ is larger than Na+ because the ionic radius increases in a particular group on moving from top to bottom due to increase in the principle energy shell though the number or electrons in the valence shell remain the same.

#### Which is larger Li+ or Na+?

As Na atom is larger than Li atom, therefore, Na+ ion is also bigger in size than Li+ion. (v) P or As: Both these atoms belong to group 15 of the periodic table. Since As is placed after P, therefore its size is large because atomic size increases down the group.

What element has the largest atomic radius Why?

Why is the ionic radius of K+ smaller than CL?

K+ has a bigger effective nuclear charge than Cl−, which translates to a bigger net positive charge felt by the outermost electrons. This will compress the energy levels a bit and make the ionic radius smaller for the potassium cation.

## What is the atomic radius of arsenic?

185 pm

What is the correct order of radius?

3) The correct order of radii is: The atomic size decreases across a period from left hand side to right hand side. The correct order is: N < B < Be. Atomic radius decreases.

Which is the smallest element with the largest atomic radius?

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.

### When does the atomic radius of an element decrease?

as the atomic number increases, the atomic radius decreases. Atomic radius of period 3 elements Na Mg Al Si P S Cl Ar Period 3 element 0.08 0.10 0.12 0.14 0.16 0.18 0.20 Atomic radius /nm

What is the atomic radius of period 3?

Atomic radius of period 3 elements Na Mg Al Si P S Cl Ar Period 3 element 0.08 0.10 0.12 0.14 0.16 0.18 0.20 Atomic radius /nm

How are atomic radii used in the periodic table?

In the table above, most of the atomic radii listed are average atomic radii, while for the halogens (Group 7A) and the noble gases (Group 8A) the covalent radius is used. Atomic radii vary in a predictable way across the periodic table.