# What Causes The Shielding Effect To Remain Constant?

Answer and Explanation: The number of inner shell electronsshell electronsEach shell can contain only a fixed number of electrons: the first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons.https://en.wikipedia.org › wiki › Electron_shellElectron shell – Wikipedia being constant causes the shielding effect to remain constant across a period.

## Why does the shielding effect remain constant as you move from left to right across the periodic table?

I believe that electron shielding remains constant because when you move across a period, you are essentially adding more valence electrons, not shielding electrons, in your valence shell. Therefore, your valence-electron-count increases from left to right in a period, but your shielding-electron-count stays the same.

## Why is shielding effect constant across a period?

It is also referred to as the screening effect or atomic shielding. Shielding effect is the same across periods but increases across groups. This is because across the periods all the outermost electrons are in the same shell meaning they're all the same distance from the nucleus.

## What happens to the shielding effect when you move from left to right on the periodic table?

So the amount of shielding is increasing as we move left to right. The apparent contradiction with the ionization energy comes about because you have not considered the increase in the actual nuclear charge. Each time we add a 2p electron, we also add a proton to the nucleus.

## How is the shielding constant determined?

Hint: Slater's rule is used to calculate shielding constant. Formula used- $= (0.35 \times n) + (0.85 \times m) + (1.00 \times p)$ where n is number of electrons in n shell, m is number of electrons in n-1 shell, p is number of electrons in the remaining inner shells. Find the number of electrons in n shell.

## What happens to the shielding effect across a period?

Shielding effect is the same across periods but increases across groups. This is because across the periods all the outermost electrons are in the same shell meaning they're all the same distance from the nucleus.

## What cause the shielding effect to?

Shielding is caused by the combination of partial neutralization of nuclear charge by core electrons, and by electron-electron repulsion. The amount of charge felt by an electron depends on its distance from the nucleus.

## Why does shielding increase across a period?

Across a period, effective nuclear charge increases as electron shielding remains constant. This pulls the electron cloud closer to the nucleus, strengthening the nuclear attraction to the outer-most electron, and is more difficult to remove (requires more energy).