Question

What is the value of screening constant for outermost electron in Be?
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Answer 1

Answer:

According to the question, screening constantly measures the shielding of an electron from the charge of the nucleus by the inner electrons. It is denoted by (σ). The magnitude of this effect depends on the number of electrons in the inner shell.

Formula used – σ=Z-Z∗

Where σ is screening constant

Z is atomic number

Z∗ is effective nuclear charge

Answer 2

Answer:

The screening constant for Beryllium is $\bold{0}$.

Explanation:

According to the question, screening constantly measures the shielding of an electron from the charge of the nucleus by the inner electrons. It is denoted by (σ). Another name of screening effect is shielding effect.

Formula used:

$-\sigma =Z-Z*$

Where $\sigma$ is screening constant

$Z$ is atomic number

$Z*$ is effective nuclear charge

Now, the electronic configuration of Beryllium is $1s^22s^2$

So, atomic number of Beryllium is $4$

Now, the effective nuclear charge of Beryllium is $4$

According to the formula, by substituting all the values we get

$\sigma=Z-Z*\\\sigma=4-4\\\sigma=0$

So, the screening constant for Beryllium is $0$.

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