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. 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.
Which element in Period 2 has the smallest atomic radius?
Fluorine is the element with smallest atomic radii.
Which is the smallest period of atom?
1 Answer. The inert gases are in fact the SMALLEST atoms of their respective Periods.
Which one of the following has the smallest radius?
Hence, Cl has the smallest radius.
Which element in group 1 has the smallest atomic radius?
(A) Trends in the Atomic Radius of Group 1 (IA, Alkali Metals) Elements
| Element | Atomic Number (Z) | Trend |
|---|---|---|
| lithium | 3 | smallest | |
| sodium | 11 | ↓ |
| potassium | 19 | ↓ |
| rubidium | 37 | ↓ |
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). The answer is letter D. As you go down the periodic table, the atomic radius increases and as you go across the periodic table, the atomic radius decreases.
What element has the largest 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 has 2 electron shells?
Electrons
| Atomic Number | Element | Energy Levels or “shells” |
|---|---|---|
| 2 | Helium (He) | 2 |
| 3 | Lithium (Li) | 2 |
| 4 | Beryllium (Be) | 2 |
| 5 | Boron (B) | 2 |
Which has largest radius?
Since the atomic radius decreases in a period but increases down the group so Sr of group II and period V is largest in size.
Which atom has the highest ionization energy?
The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.
How do you find atomic radius?
The radius of an atom can only be found by measuring the distance between the nuclei of two touching atoms, and then halving that distance. As you can see from the diagrams, the same atom could be found to have a different radius depending on what was around it. The left hand diagram shows bonded atoms.
Which of the following has the minimum atomic radius?
Fluorine has a minimum atomic radius. The atomic radius of Fluorine is 42 pm.
Which element has 4 valence electrons and 3 energy levels?
| Element | Element Number | Number of Electrons in each Level |
|---|---|---|
| Beryllium | 4 | 2 |
| Boron | 5 | 3 |
| Carbon | 6 | 4 |
| Nitrogen | 7 | 5 |
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.
What is the atomic radius of SI?
210 pm
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 |