Answer. Atomic radii vary in a predictable way across the periodic table. 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 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.
…
Periodic Trends — Atomic and Ionic Radii.
| 3A | (13) |
|---|---|
| 4A | (14) |
| 5A | (15) |
| 6A | (16) |
Which of the following atoms of elements has the largest atomic radius?
So Cesium has the largest atomic radius among the given elements.
Which has largest radius?
Atomic radii are measured in picometers (one picometer is equal to one trillionth of a meter). Hydrogen (H) has the smallest average atomic radius at about 25 pm, while caesium (Cs) has the largest average radius at about 260 pm.
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.
What is the largest atomic radius in Group 18?
The Electron Configurations for Noble Gases
| Atomic # | Atomic radius (pm) | |
|---|---|---|
| Ar | 18 | 71 |
| Kr | 36 | 88 |
| Xe | 54 | 108 |
| Rn | 86 | 120 |
Which has the largest atomic radius mg Si S or Na?
Therefore the largest atoms are on the left and the smallest on the right. So sodium (Na) has the largest atomic radius, as the valence electrons are the least attracted to the nucleus.
What is carbon’s atomic radius?
170 pm
Why is atomic radius of K greater 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.
Which has a larger radius Na or Na 1?
So p/e ratio is 1 and Na+ ion nucleus has eleven positive (p) charge and ten negative charge (e). … As is known from the chemistry course, when the element loses electron (turn into cation, with positive charge), the atom radius is getting low, so obviously Na+ is smaller than Na.
Which has a larger radius S or CL?
Answer. Sulphur(S) has the largest atomic radius beaches on moving left to right in a period, Atomic Radius decreases.
Which has the largest radius Co3+ Mn3+ fe3+ Cr3+?
Fe 3+ has highest radii because by going left to right in the periodic table , the size get decreased so .. Fe 3+ >Co3+ >Cr3+ >Mn3+ .
Which element has the largest atomic radius in Group 1?
Trends in Atomic Radius of Group 1 Elements
| name | atomic radius (pm) | Trend |
|---|---|---|
| sodium | 186 | ↓ |
| potassium | 425 | ↓ |
| rubidium | 244 | ↓ |
| caesium | 262 | largest |
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 has a larger atomic radius S or S2?
(ii) Explain why the radius of the S2- ion is larger than the radius of the S atom. The nuclear charge is the same for both species, but the eight valence electrons in the sulfide ion experience a greater amount of electron-electron repulsion than do the six valence electrons in the neutral sulfur atom.