Explanation: 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.
How do you find the smallest 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.
Which has smallest radius?
Hence, Cl has the smallest radius.
Which of the following has the minimum atomic radius?
Fluorine has a minimum atomic radius. The atomic radius of Fluorine is 42 pm.
Does hydrogen have the smallest atomic radius?
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 element has a larger atomic radius?
Explanation: Francium has the largest, Helium has the lowest. Atomic radius increases as you go to the left and downward due to the attraction of electrons and the nucleus in an atom.
Which has a larger atomic radius Na or Na 1?
Ne will have bigger radius than Na+1 because in Ne there are equal number of electrons and the number of protons.
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 ion has largest radius?
1 Answer. Ernest Z. K+ has the largest radius.
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.
Which of the following halogens has the largest atomic radius?
(B) Trends in the Atomic Radius of Group 17 (VIIA, Halogens) Elements
| Element | Atomic Number (Z) | Trend |
|---|---|---|
| fluorine | 9 | (smallest) ↓ |
| chlorine | 17 | ↓ |
| bromine | 35 | ↓ |
| iodine | 53 | ↓ (largest) |
Which element has a smaller atomic radius lithium or fluorine Why?
3. An atom of fluorine is smaller than an atom of lithium because with more protons the electrons are pulled closer to the nucleus. 4. An atom of fluorine is smaller than an atom of lithium because fluorine has a high ionization energy and will not lose electrons as easily as lithium.
Which element has the smallest atomic radius quizlet?
Therefore, rubidium has the largest atomic radius whereas helium has the smallest.
Why is K bigger 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.
Why does atomic radius increase from right to left?
This is caused by the increase in the number of protons and electrons across a period. One proton has a greater effect than one electron; thus, electrons are pulled towards the nucleus, resulting in a smaller radius. Atomic radius increases from top to bottom within a group. This is caused by electron shielding.
Are there any exceptions to the atomic radius trend?
Periodic Trend
The atomic radius of atoms generally decreases from left to right across a period. There are some small exceptions, such as the oxygen radius being slightly greater than the nitrogen radius. … Since the force of attraction between nuclei and electrons increases, the size of the atoms decreases.