Unit 3: Periodic Table and Periodicity of Properties

Which of the following elements has the smallest ionization energy?

• A) Helium
• B) Neon
• C) Argon
• D) Krypton

Answer: D) Krypton

Which element in Group 16 is known for forming strong acids when combined with hydrogen?

• A) Oxygen
• B) Sulfur
• C) Selenium
• D) Tellurium

Answer: B) Sulfur

Which of the following elements is most likely to form an anion with a -2 charge?

• A) Fluorine
• B) Chlorine
• C) Oxygen
• D) Sulfur

Answer: D) Sulfur

Which element has the electron configuration [Kr] 5s² 4d⁹?

• A) Silver
• B) Palladium
• C) Rhodium
• D) Copper

Answer: D) Copper

Which of the following elements has the highest atomic number?

• A) Yttrium
• B) Zirconium
• C) Niobium
• D) Molybdenum

Answer: D) Molybdenum

Which element in Group 1 has the highest melting point?

• A) Sodium
• B) Potassium
• C) Lithium
• D) Rubidium

Answer: C) Lithium

Which element is the most reactive halogen?

• A) Chlorine
• B) Bromine
• C) Fluorine
• D) Iodine

Answer: C) Fluorine

Which of the following elements would you expect to have a relatively high density?

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

Answer: D) Iron

Which of the following elements is in Period 3 and Group 14?

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

Answer: B) Silicon

Which property generally increases as you move across a period from left to right?

• A) Atomic radius
• B) Electronegativity
• C) Metallic character
• D) Chemical reactivity

Answer: B) Electronegativity

Which element is found in Period 2 and has the electron configuration [He] 2s² 2p¹?

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

Answer: A) Boron

Which element in Group 3 has the electron configuration [Kr] 5s² 4d¹⁰ 5p¹?

– A) Indium

– B) Thallium

– C) Gallium

– D) Aluminium