Answer: Potassium (K) with an atomic number of 19 has the largest atomic radius. This is because sodium and potassium are elements of group 1. On moving from top to bottom in a group, the atomic radius increases.
Which of the following has the largest atomic radius Na K Mg Ca?
The element potassium (K) present in group 1 has the largest atomic radius.
Which has largest radius mg or CA?
1 Expert Answer
Calcium has a larger atomic radius than Magnesium. If you look on the period table you will notice Magnesium atomic number is 12, while Calcium is 20. Calcium(Ca) has 4 energy level while magnesium(Mg) has 3 Energy level.
Which element will have 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.
Which one has larger atomic radius CA or K Why?
Ca2+ has smaller ionic radius than K+ because it has more nuclear charge. In a given period, on moving from left to right, the nuclear charge increases without addition of shell. The increased nuclear charge attracts the electrons more strongly towards the nucleus. This decreases the ionic size.
Which element has the largest atomic radius K or Na?
As an example, potassium (K) has a larger average atomic radius (220 pm)than sodium (Na) does (180 pm). The potassium atom has an extra electron shell compared to the sodium atom, which means its valence electrons are further from the nucleus, giving potassium a larger atomic radius.
Which element has the largest atomic radius sodium or potassium?
Potassium (K) with an atomic number of 19 has the largest atomic radius. This is because sodium and potassium are elements of group 1. On moving from top to bottom in a group, the atomic radius increases. Magnesium and calcium are elements of group 2.
Which has largest radius?
Na has the largest atomic radius. Reason: Li : belongs to the 2nd period. Na and Cl : belong to the 3rd period.
Which element has the smallest 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.
Is CA bigger than MG?
Ca atom will be larger than Ca2+ because cations are smaller than their parent atom. The Ca2+ cation is larger than the Mg2+ cation since the calcium cation has one more complete level than the magnesium cation.
What element has the second largest atomic radius?
(A) Trends in the Atomic Radius of Elements in Period 2
| Element | Li | Be |
|---|---|---|
| Energy Level being filled (Valence Shell) | second (L) | second (L) |
| Nuclear Charge (charge on all protons) | 3+ | 4+ |
| Atomic Radius (pm) | 134 | 90 |
| General Trend | (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 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.
Is Br or Br bigger?
Br – will have the largest atomic size because Br- has one extra electron in its valence shell which due to its unbalanced negative charge will be repelled and hence the atomic radius of Br- will increase.
Is K+ or Ca2+ bigger?
(d) K+ is larger than Ca2+ Isoelectronic; Ca2+ has more protons to pull e- inward.
Which is larger k or k+?
The cation of K+ is formed when K loses this outermost single electron to attain “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+.