Quick Answer: Which element in period 3 has the smallest atomic radius?

Which elements have the smallest atomic radius?

Explanation: Helium has the smallest atomic radius.

Which element in period 3 has the largest atomic radius?

• Atomic radius decreases from left to right within a period. This is caused by the increase in the number of protons and electrons across a period. …
• Considering this trend Sodium is having a highest atomic radius in 3rd period.

Which is the element with the smallest atomic radii in the third period of modern periodic table state the reason for your answer in one or two sentences?

Due to large positive charge on the nucleus, the electrons are pulled closer to the nucleus and the size of atom decreases. Be has smallest atomic radius because 19K, 3Li, 11Na are present in same group 1 but Be is present in group 2.

Which of the following has smallest radius?

Hence, Cl has the smallest radius.

What element has the biggest atomic radius?

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.

What element in the second period has the largest atomic radius?

The element in the second period that has the largest atomic radius is the Lithium (Li).

Does atomic radius increase Period 3?

Explanation of this trend

Going across period 3: the number of protons in the nucleus increases so … … therefore the force of attraction between the nucleus and the electrons increases … and the atomic radius decreases.

Which element in the 3rd period has the smallest atomic size the largest?

(B) Trends in the Atomic Radius of Elements in Period 3

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.

Which element in Period 4 has the largest atomic radius?

For Period 3, the Group1 Alkali Metal (potassium, lowest Z) has the largest atomic radius and the Group 7/17 Halogens & Group 0/18 Noble Gas (bromine & krypton, highest Z’s) have the smallest atomic radii (there is some uncertainty in the noble gas radii).
…

What is the atomic radius for NA?

227 pm

What causes the atomic radius of the elements to decrease across Period 3 from left to right?

Atomic radius decreases across a period because valence electrons are being added to the same energy level at the same time the nucleus is increasing in protons. The increase in nuclear charge attracts the electrons more strongly, pulling them closer to the nucleus.

Which ion has lowest atomic radius?

Because K + has the greatest nuclear charge (Z = 19), its radius is smallest, and S 2− with Z = 16 has the largest radius.

Which of the following has the minimum atomic radius?

Fluorine has a minimum atomic radius. The atomic radius of Fluorine is 42 pm.

What happens to the atomic radius when an electron is lost?

When an atom loses an electron to form a cation, the lost electron no longer contributes to shielding the other electrons from the charge of the nucleus; consequently, the other electrons are more strongly attracted to the nucleus, and the radius of the atom gets smaller.