Best answer: Which group has the largest atomic radius?

Which elements have the largest atomic radius?

Francium has the largest, Helium has the lowest. Atomic radius increases as you go to the left and downward due to the attraction of electrons and the nucleus in an atom.

Which group 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. 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 has the largest atomic radius in Group 1?

Trends in Atomic Radius of Group 1 Elements

Which is the largest group in periodic table?

Group 1(H, Li, Na, K, Rb, Cs, Fr) is the longest group in the periodic table. The first group is called the alkali metals group.

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 element has the second largest atomic radius?

(A) Trends in the Atomic Radius of Elements in Period 2

What is the largest atomic radius in Group 18?

The Electron Configurations for Noble Gases

Does CA or NI have a larger atomic radius?

Ca or Ni: the atomic radius of calcium is 194 pm while that of nickel is 149 pm.

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 metal 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.

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.

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.

What is the name of group number 1?

Alkali metal, any of the six chemical elements that make up Group 1 (Ia) of the periodic table—namely, lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). The alkali metals are so called because reaction with water forms alkalies (i.e., strong bases capable of neutralizing acids).

What is the most abundant element in the universe?

Hydrogen — with just one proton and one electron (it’s the only element without a neutron) — is the simplest element in the universe, which explains why it’s also the most abundant, Nyman said.

Are lanthanides and actinides radioactive?

Both actinides and lanthanides are highly reactive with elements from the halogen group. All of the lanthanides have at least one stable isotope except for promethium. None of the actinides have a stable isotope. They are all radioactive.