Question

1. Calculate the effective nuclear charge of magnesium.​

Answer 1

Answer:

First we must determine the electron configuration of magnesium to determine the number of core electrons. Mg =1s2 2s2 2p6 3s2 = [Ne]3s2, therefore magnesium has 10 core electrons from its 1s2, 2s2, 2p6 orbitals. Magnesium is element 12, so it has 12 protons and a nuclear charge of 12.

Answer 2

Calculate the effective nuclear charge of magnesium.​

• Magnesium has an electron configuration of [Ne]3s2 [N e] 3 s 2, which indicates that each atom of the element contains two valence electrons. Hence, 12 2 = 10 shielding electrons are present in magnesium. Zeff = 12 - 10 = 2+ as a result. As magnesium is an element with a nuclear charge of 12, it possesses 12 protons.
• The term "effective nuclear charge" refers to the net positive charge that an electron in a polyelectronic atom experiences. Electrons and protons are the two elements that cause the effective nuclear charge to rise. Zeff=ZS is the actual nuclear charge. This number provides details regarding an electron's charge.
• The following is the definition of effective nuclear charge: It is the net positive charge that the outer electrons experience as a result of the inner shell electrons' protection of the positive charge. Zeff stands for the effective nuclear charge.
• Magnesium has an effective nuclear charge of about 2, while aluminium has an effective nuclear charge of about 3. F.

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