Question 1:

Which of the following elements is classified as a metal?

Explanation: The correct answer is B) Sodium. Sodium is a metal, while oxygen is a nonmetal and silicon is a metalloid.

Question 2:

Which group of elements is generally good conductors of heat and electricity?

Explanation: The correct answer is A) Metals. Metals are generally good conductors of heat and electricity.

Question 3:

Which of the following elements is classified as a nonmetal?

Explanation: The correct answer is B) Nitrogen. Nitrogen is a nonmetal, while calcium is a metal and boron is a metalloid.

Question 4:

Which group of elements is generally brittle and poor conductors of heat and electricity?

Explanation: The correct answer is A) Nonmetals. Nonmetals are generally brittle and poor conductors of heat and electricity.

Question 5:

Which group of elements exhibits properties intermediate between metals and nonmetals?

Explanation: The correct answer is A) Metalloids. Metalloids exhibit properties intermediate between metals and nonmetals.