Unit 3: Periodic Table and Periodicity of Properties

Which element is a transition metal located in Period 6?

• A) Platinum
• B) Gold
• C) Palladium
• D) Silver

Answer: B) Gold

Which property of an element tends to increase as you move down a group in the Periodic Table?

• A) Electronegativity
• B) Ionization energy
• C) Atomic radius
• D) Electron affinity

Answer: C) Atomic radius

Which of the following elements is an alkaline earth metal in Period 4?

• A) Calcium
• B) Magnesium
• C) Strontium
• D) Barium

Answer: C) Strontium

Which element in Group 15 has the highest ionization energy?

• A) Phosphorus
• B) Nitrogen
• C) Arsenic
• D) Antimony

Answer: B) Nitrogen

Which of the following elements is in Period 3 and is a metalloid?

• A) Silicon
• B) Boron
• C) Aluminum
• D) Phosphorus

Answer: A) Silicon

Which of the following trends is observed in the Periodic Table with regard to electron affinity?

• A) It increases from left to right within a period.
• B) It decreases from left to right within a period.
• C) It decreases from top to bottom within a group.
• D) It remains constant across periods.

Answer: A) It increases from left to right within a period.

Which element in Period 4 has the electron configuration [Ar] 4s² 3d⁷?

• A) Cobalt
• B) Iron
• C) Nickel
• D) Copper

Answer: A) Cobalt

Which of the following elements has the smallest atomic radius?

• A) Beryllium
• B) Boron
• C) Carbon
• D) Nitrogen

Answer: D) Nitrogen

Which of the following elements is most likely to lose two electrons to form a +2 ion?

• A) Sodium
• B) Calcium
• C) Iron
• D) Aluminum

Answer: B) Calcium

Which of the following is a characteristic of noble gases?

• A) They have low ionization energies.
• B) They are highly reactive.
• C) They have full outer electron shells.
• D) They form metallic bonds.

Answer: C) They have full outer electron shells.