Periodic Trends and Electron Configurations Review

Which element has the highest electronegativity?

• Fluorine

• Oxygen

• Nitrogen

• Chlorine

Answer explanation

Fluorine has the highest electronegativity among the given elements, making it the correct choice for the element with the highest electronegativity.

What is the electron configuration of Carbon?

Answer explanation

The correct electron configuration of Carbon is 1s^2 2s^2 2p^2, indicating the distribution of electrons in the various energy levels and orbitals.

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Which orbital is filled immediately after the 3p orbital?

• 3d

• 4s

• 4p

• 3s

Answer explanation

The 4s orbital is filled immediately after the 3p orbital according to the Aufbau principle in electron configuration.

What trend does electronegativity follow on the periodic table?

• Increases from left to right and decreases from top to bottom

• Decreases from left to right and increases from top to bottom

• Increases from left to right and increases from top to bottom

• Decreases from left to right and decreases from top to bottom

Answer explanation

Electronegativity increases from left to right across periods and decreases from top to bottom within groups on the periodic table.

Which of the following elements has the lowest electronegativity?

• Fluorine

• Francium

• Oxygen

• Nitrogen

Answer explanation

Francium has the lowest electronegativity among the given elements.

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What is the electron configuration of Oxygen?

Answer explanation

The correct electron configuration of Oxygen is 1s^2 2s^2 2p^4, indicating the distribution of electrons in the atom's orbitals.

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Which of the following orbitals has the highest energy level?

• 2s

• 3p

• 3d

• 4s

Answer explanation

The 4s orbital has the highest energy level among the given options according to the Aufbau principle.

How many electrons can the d orbital hold?

• 2

• 6

• 10

• 14

Answer explanation

The d orbital can hold a maximum of 10 electrons, with each subshell (5 in total) accommodating 2 electrons each.

• Chlorine

• Fluorine

• Bromine

• Iodine

Answer explanation

The element with a valence electron configuration of s^2 p^5 is Chlorine. Chlorine has 7 valence electrons, with 2 in the s orbital and 5 in the p orbital.

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What is the general trend for atomic radius across a period in the periodic table?

• Increases from left to right

• Decreases from left to right

• Remains constant across a period

• First increases, then decreases

Answer explanation

The general trend for atomic radius across a period in the periodic table is that it decreases from left to right.

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