Which element has the largest radius Na or CS?

Which element has the largest 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.

Does CS have a larger atomic radius?

It has many meanings in chemistry/science/medicine, etc. Atomic radius increases going from right to left across a period, and going from top to bottom within a group. Comparing Li (Group I, period 2) to Cs (Group 1, period 6), Cs would have a larger atomic radius.

Why is cesium bigger than elemental sodium?

At the atomic (electron orbital) level, the more electrons an atom has, the more diffuse they have to be due to charge repulsion and the Pauli exclusion principle. … Thus, an atom of cesium is larger than an atom of sodium, but an atom of chlorine is actually smaller than the sodium atom.

Which has the largest atomic radius K or Cs?

Atom size general trend: 1) Atom size (Atomic radius) increases from up to down along each column(group) of the periodic table. For example, in the first group, the Atomic radius trend from smallest to greatest is: H (smallest) — Li — Na — K — Rb — Cs — Fr (greatest).

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.

What has the smallest 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.

What is the atomic radius for CS?

343 pm

Why does lithium have the largest atomic radius?

The effective nuclear charge is simply a measure of the net positive charge that affects the outermost electrons in an atom. In lithium’s case, the outermost electron is being screened from the nucleus by two core electrons. … That is why lithium has a larger atomic radius than beryllium.

Is K larger than 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+.

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.

What is the largest atom in Group 4?

Cesium (Cs), tucked in the lower left hand corner of the table, has the largest known atoms. The atomic radius of Cs is given variously as 273.1 pm [1], 265 pm [2], 265.5 pm [3] or 260 pm [4]. Rubidium also has large atoms, but its atomic radius is almost 30 pm less than cesium’s.

Which group has the highest metallic character?

The alkali metals in group 1 are the most active metals, and cesium is the last element in the group for which we have experimental data. Francium is extremely rare and is radioactive, with the longest half-life at 22 min, so there is no empirical evidence that francium is the most metallic element.

Why calcium atom is smaller than potassium atom?

Calcium atoms have smaller radii than potassium atoms since calcium atoms have a greater nuclear charge. … Since there will be more delocalized electrons per atom throughout calcium than potassium, the bond strength is stronger in calcium than potassium.

Which ion has largest radius?

K +, Cl −, and S 2− form an isoelectronic series with the [Ar] closed-shell electron configuration; that is, all three ions contain 18 electrons but have different nuclear charges. Because K + has the greatest nuclear charge (Z = 19), its radius is smallest, and S 2− with Z = 16 has the largest radius.

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.