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 ion has the largest atomic radius?
1 Answer. Ernest Z. K+ has the largest radius.
Which atom has the largest atomic radius quizlet?
The general trend in atomic radius is that moving down the periodic table, the size increases; moving across the periodic table from left to right, the size decreases. Therefore, rubidium has the largest atomic radius whereas helium has the smallest.
Which of the following has maximum atomic radius?
Thus, Mg has maximum size.
How can you tell which atom is larger?
An atom gets larger as the number of electronic shells increase; therefore the radius of atoms increases as you go down a certain group in the periodic table of elements. In general, the size of an atom will decrease as you move from left to the right of a certain period.
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.
Which ion has largest size?
Consequently, the ion with the greatest nuclear charge (Al 3 +) is the smallest, and the ion with the smallest nuclear charge (N 3−) is the largest.
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Ionic Radii and Isoelectronic Series.
| Ion | Radius (pm) | Atomic Number |
|---|---|---|
| N 3− | 146 | 7 |
| O 2− | 140 | 8 |
| F − | 133 | 9 |
| Na + | 98 | 11 |
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.
Which atom has the largest atomic radius S or O?
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 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.
What do you mean by atomic radius?
The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons. … Electrons do not have definite orbits nor sharply defined ranges.
Which group of atoms has nearly same atomic radius?
Fe, Co and Ni are transition metals in the same period where the atomic radii do not vary much. This is due to the extra screening by the 3d electrons which offset the increasing pull by the additional protons going from Fe to Co and Ni on the outer 4s electrons.
What is the symbol for francium?
Fr
Which is larger mg or mg2+?
Answer. So Mg atom will be larger as it has more electrons than Mg 2+ and thus will have larger atomic radii.
Which atom is the smallest?
Consequently, the smallest atom is helium with a radius of 32 pm, while one of the largest is caesium at 225 pm.
Is O or O2 larger?
O2− is larger than O because the increase in electron repulsions that accompany addition of an electron causes the electron cloud to expand. O2− is larger than O because O is neutral but O2− has a charge 2−.