Why does lithium have a smaller atomic radius than potassium?

Why does lithium have a smaller atomic radius than potassium?

This is because as the number of electrons increases, the attractive forces on each electron becomes stronger. As the attractive forces become stronger, the electrons are drawn closer to the nucleus, and thus the atom is smaller.

Does potassium have a larger atomic radius?

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.

Does lithium have a larger atomic radius?

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. In fact, atomic radius decreases as you move from left to right across a period.

Is Br or I bigger?

Because Iodine has the greatest atomic number, it has a larger radius. This rules out Br and Cl. I- is Iodine in the 1- oxidation state. This means that is has 1 extra electron, and its radius is therefore greater than I.

Which one has the largest size BR I CL?


Is BR bigger than F?

Negative ions are bigger than the atoms they come from. Chlorine is 2,8,7; Cl- is 2,8,8. Although the electrons are still all in the 3-level, the extra repulsion produced by the incoming electron causes the atom to expand….

vdW radius (nm) ionic radius of X- (nm)
F 0.147 0.133
Cl 0.175 0.181
Br 0.185 0.196
I 0.198 0.220

Which is the largest cation?

Consequently, the ion with the greatest nuclear charge (Al 3 +) is the smallest, and the ion with the smallest nuclear charge (N 3−) is the largest….Ionic Radii and Isoelectronic Series.

Ion Radius (pm) Atomic Number
N 3− 146 7
O 2− 140 8
F − 133 9
Na + 98 11

Which is the smallest cation?

The smallest cation and the smallest anion are respectively

  • H+ and H-
  • H+ and F-
  • Li+ and H-
  • Li+ and F-

Which element has the smallest atomic radius calcium potassium scandium titanium?

The given elements potassium, calcium, scandium, and titanium all belongs to third period. Therefore, out of these elements potassium is at the extreme left and titanium is towards the right. Thus, we can conclude that titanium is the element which has the smallest atomic radius.

Which element has the largest atomic radius TI or as?

Atomic Radius of the elements

Helium 31 pm Cadmium
Argon 71 pm Rhodium
Chlorine 79 pm Gold
Boron 87 pm Titanium
Sulfur 87 pm Platinum

Which element has a larger atomic radius than sulfur chlorine cadmium fluorine oxygen?

Answer: Cadmium has larger atomic radius than sulfur.

What is the predicted order of first ionization energies from highest to lowest for lithium?

Answer Expert Verified. The first ionization energy is the energy that the atom lost its first electrons. The energy decrease and the atom is more reactive. So from highest to lowest is Li>Na>K>Rb.

Which element will have the least attraction for an electron?


Why does ionic radius increase as you move down a group?

As you move down a column or group, the ionic radius increases. This is because each row adds a new electron shell. More protons are added, but the outer valence shell remains the same, so the positively charged nucleus draws in the electrons more tightly.

What is the atomic radius trend across a period?

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.