Periodic Trend: Effective Nuclear Charge Video Lessons

Concept: Periodic Trend: Effective Nuclear Charge

Problem: Classify each statement about effective nuclear charge, Zeff, as true or false.1. A 1s electron in a B atom has a smaller Zeff than a 1s electron in a Be atom.2. Effective nuclear charge does not depend on the number of electrons present in an atom.3. Across a period, as Zeff increases, atomic size increases.4. Effective nuclear charge increases from left to right across a period on the periodic table.5. In a Be atom, 1s electron has a greater Zeff than a 2s electron.6. Electrons in an s orbital are more effective than those in other orbitals at shielding other electrons from nuclear charge.

FREE Expert Solution

1. A 1s electron in a B atom has a smaller Zeff than a 1s electron in a Be atom.

Recall: Zeff = Z – S; Z = atomic number

Atomic number of B = 5

Atomic number of Be = 4

The statement is false.

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Problem Details

Classify each statement about effective nuclear charge, Zeff, as true or false.

1. A 1s electron in a B atom has a smaller Zeff than a 1s electron in a Be atom.

2. Effective nuclear charge does not depend on the number of electrons present in an atom.

3. Across a period, as Zeff increases, atomic size increases.

4. Effective nuclear charge increases from left to right across a period on the periodic table.

5. In a Be atom, 1s electron has a greater Zeff than a 2s electron.

6. Electrons in an s orbital are more effective than those in other orbitals at shielding other electrons from nuclear charge.