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 radius?
1 Answer. Ernest Z. K+ has the largest radius.
Which of the following will have a bigger radius?
The third period will have larger atomic radius than the second period since the third period lies below the second period. Moreover, Na lies to the left of the periodic table and Cl lies to the right of the periodic table. Hence Na has the largest atomic radius of the above-mentioned elements.
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 has the largest radius O or O 2?
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−. … S2− is larger than O2− because for particles with like charges, size increases going down a family.
What has the smallest atomic radius?
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.
Which has larger atomic radius K 19 or CA 20?
Answer. Answer: Potassium ( k ) – > atomic number 19 has larger atomic radii.
Which has the largest atomic radius lithium or potassium?
Lithium has an atomic number of 3. It can be accomodated in 2shells. Because of the large atomic sells of Potassium, it’s atomic radius is Much larger than that of Sodium or Lithium.
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.
What is the radius of K+?
280 pm
Which has the largest atomic radius carbon or oxygen?
Atomic Radius of the elements
| Helium | 31 pm | 161 pm |
|---|---|---|
| Oxygen | 48 pm | 167 pm |
| Hydrogen | 53 pm | 169 pm |
| Nitrogen | 56 pm | 171 pm |
| Carbon | 67 pm | 171 pm |
Which is bigger O 1 or O 2?
O+1 ion contains 7 electrons and 8 protons ,O contains 8 electrons and 8 protons ,O-1 ion contains 9 electrons and 8 protons and O-2 ion contains 10 electrons and 8 protons. So O-2 is biggest in size.
Which is larger in radius K+ or K?
These are electrons with “highest energy level”. When at neutral, the potassium ion in the form of K has an electronic configuration of: … The K+ ion has its outermost electrons on the third energy level now and is size is smaller than that of K ion. Hence, K is larger than K+.
Is O2 bigger than F?
Explanation: From top to bottom of the periodic table ions will increase in radii. However, now left to right the radius is more of a function of the number of electrons. … Similarly, O2- will be larger than F- as both have 10 electrons but Z=8 for oxygen and Z=9 for fluorine.