Periodic Trends Review

Which element has a larger atomic radius, sodium (Na) or magnesium (Mg)?

• Sodium (Na)

• Magnesium (Mg)

What is the general trend for ionization energy across a period in the periodic table?

• It decreases from left to right.

• It increases from left to right.

• It remains constant.

• It first increases, then decreases.

Which of the following elements would likely have the highest electron affinity?

• Nitrogen (N)

• Oxygen (O)

• Fluorine (F)

• Neon (Ne)

What is the correct electron configuration for chlorine (Cl)?

• 1s² 2s² 2p⁶ 3s² 3p⁵

• 1s² 2s² 2p⁶ 3s² 3p⁶

• 1s² 2s² 2p⁴ 3s² 3p⁵

• 1s² 2s² 2p⁶ 4s² 3p⁵

According to Hund's Rule, which of the following is true about electron configuration?

• Electrons fill the lowest energy orbitals first.

• Electrons in the same orbital must have opposite spins.

• Electrons will fill an unoccupied orbital before they pair up.

• All of the above are true.

Which of the following elements has the smallest atomic radius?

• Calcium (Ca)

• Potassium (K)

• Scandium (Sc)

• Argon (Ar)

What is the general trend for atomic radius down a group in the periodic table?

• It decreases.

• It increases.

• It remains constant.

• It first increases, then decreases.

Which of the following correctly represents the orbital filling order according to the Aufbau principle?

• 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p

• 1s, 2s, 2p, 3s, 3p, 3d, 4s, 4p

• 1s, 2p, 2s, 3p, 3s, 4p, 4s, 3d

• 1s, 2s, 3s, 2p, 3p, 4s, 3d, 4p

Which element has a higher ionization energy, sulfur (S) or phosphorus (P)?

• Sulfur (S)

• Phosphorus (P)

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

• It decreases from left to right.

• It increases from left to right.

• It remains constant.

• It first increases, then decreases.