Which element in Group 2 has the largest atomic radius?

Which element in Period 2 has the largest atomic radius?

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

What 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.

What is the trend in atomic radius down Group 2?

Group 2 Elements are called Alkali Earth Metals. They are called s-block elements because their highest energy electrons appear in the s subshell. Progressing down group 2, the atomic radius increases due to the extra shell of electrons for each element. Going down the group, the first ionisation energy decreases.

Which element has the largest atomic radius in period 3?

• Atomic radius decreases from left to right within a period. This is caused by the increase in the number of protons and electrons across a period. …
• Considering this trend Sodium is having a highest atomic radius in 3rd period.

What elements have the smallest atomic radius?

Explanation: Helium has the smallest atomic radius.

Which metal has the smallest 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.

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.

Which has the largest atomic radius mg Si S or Na?

Therefore the largest atoms are on the left and the smallest on the right. So sodium (Na) has the largest atomic radius, as the valence electrons are the least attracted to the nucleus.

Which has largest radius?

Thus O2− has a minimum z-effective thus largest radius.

Does atomic radius increase down a group?

Atomic radius is the distance from the atom’s nucleus to the outer edge of the electron cloud. In general, atomic radius decreases across a period and increases down a group. Across a period, effective nuclear charge increases as electron shielding remains constant.

How do you find atomic radius?

The radius of an atom can only be found by measuring the distance between the nuclei of two touching atoms, and then halving that distance. As you can see from the diagrams, the same atom could be found to have a different radius depending on what was around it. The left hand diagram shows bonded atoms.

Is Group 1 or Group 2 more reactive?

The outermost electrons of the alkaline earth metals (group 2) are more difficult to remove than the outer electron of the alkali metals, leading to the group 2 metals being less reactive than those in group 1. … The reactivity of group 1 elements increases as you go down the group because: the atoms become larger.

Why is the ionic radius of K+ smaller than CL?

In other words, K+ has bigger effective nuclear charge than Cl− , which translates to a bigger net positive charge felt by the outermost electrons. This will compress the energy levels a bit and make the ionic radius smaller for the potassium cation.

Does atomic radius increase Period 3?

Explanation of this trend

Going across period 3: the number of protons in the nucleus increases so … … therefore the force of attraction between the nucleus and the electrons increases … and the atomic radius decreases.

Why does sodium have a larger atomic radius than aluminum?

Of protons in aluminium(13) is more than sodium(11). That means the nuclear charge of aluminium is more and the electrons are pulled more ‘tightly’ as compared to sodium. Sodium on the other side has less nuclear charge as compared to aluminium and so the electrons are held comparatively loosely.