Lithium has an atomic number of 3 and a mass number of 7. Which of the following is the number of protons in a lithium atom?

A. 12

B. 3

C. 4

D. 7

Answer Explanation:

The number of protons in an atom is equal to its atomic number. In this case, lithium has an atomic number of 3, so it contains 3 protons.

The other choices (A, C, and D) do not represent the correct number of protons for a lithium atom.

Therefore, the Correct Answer is B.

Q #1: Lithium has an atomic number of 3 and a mass number of 7. Which of the following is the number of protons in a lithium atom?

A. 12

B. 3

C. 4

D. 7

Answer Explanation

The number of protons in an atom is equal to its atomic number. In this case, lithium has an atomic number of 3, so it contains 3 protons.

The other choices (A, C, and D) do not represent the correct number of protons for a lithium atom.
Q #2: In a phase diagram, which of the following is the term used for a substance held at a temperature and pressure where the solid, liquid, and gaseous states of a substance exist simultaneously?

A. Triple point

B. Critical temperature

C. Absolute zero

D. Critical point

Answer Explanation

A phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. A phase diagram usually has pressure on the y-axis and temperature on the x-axis. As we move along the curves of the phase diagram, we can see how the state of the substance changes from solid to liquid to gas, or vice versa.
Q #3: The measurement indicated by the line across the center of the cell is best referred to as which of the following?

A. Diameter

B. Volume

C. Area

D. Radius

Answer Explanation

One way to assess the size of a cell is to measure its diameter, which is the length of a straight line that passes through the center of the cell and touches both sides. The measurement indicated by the line across the center of the cell in the diagram is best referred to as the diameter of the cell.

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Lithium has an atomic number of 3 and a mass number of 7. Which of the following is the number of protons in a lithium atom?

More Questions on TEAS 7 Science

Q #1: Lithium has an atomic number of 3 and a mass number of 7. Which of the following is the number of protons in a lithium atom?

Answer Explanation

Q #2: In a phase diagram, which of the following is the term used for a substance held at a temperature and pressure where the solid, liquid, and gaseous states of a substance exist simultaneously?

Answer Explanation

Q #3: The measurement indicated by the line across the center of the cell is best referred to as which of the following?

Answer Explanation

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