Q: Which of the following is the correct formula to calculate the number of neutrons in an atom?

$$\text{Number of neutrons} = \text{Mass number} - \text{Atomic number}$$

Question 1

Which of the following statements best describes an element?

Accepted Answer

An element is a pure substance consisting of only one type of atom.

Question 2

What is the atomic number of an atom defined as?

Accepted Answer

The number of protons in the nucleus.

Question 3

Given a carbon atom with an atomic number of 6 and a mass number of 14, how many neutrons does it have? Use the formula $$	ext{Number of neutrons} = 	ext{Mass number} - 	ext{Atomic number}.$$

Accepted Answer

8

Question 4

Which four elements make up approximately 96% of the human body's mass?

Accepted Answer

Oxygen, Carbon, Hydrogen, Nitrogen

Question 5

Which subatomic particles are found in the nucleus of an atom?

Accepted Answer

Protons and neutrons

Question 6

If an atom has 12 protons, 12 neutrons, and 12 electrons, what is its atomic mass?

Accepted Answer

$$12 + 12 = 24$$

Question 7

Which of the following best explains why isotopes of an element have different mass numbers?

Accepted Answer

They have different numbers of neutrons.

Question 8

Which of the following is NOT a trace element found in the human body?

Accepted Answer

Oxygen

Question 9

Which property of matter is necessary for it to be considered as such?

Accepted Answer

It must occupy space and have mass.

Question 10

A student claims that the atomic number of carbon is 12 because its atomic mass is 12.01. What is the error in this reasoning?

Accepted Answer

Atomic number is determined by the number of protons, not the atomic mass.

Question 11

Which of the following best describes a molecule?

Accepted Answer

A molecule is formed when two or more atoms bond together.

Question 12

If an atom has an atomic number of 8 and a mass number of 16, how many neutrons does it have? Use $$	ext{Number of neutrons} = 	ext{Mass number} - 	ext{Atomic number}.$$

Accepted Answer

8

Question 13

Which of the following is true about the periodic table?

Accepted Answer

It organizes elements by atomic number and properties.

Question 14

Which of the following is a correct representation of the chemical symbol for calcium?

Accepted Answer

Ca

Question 15

Which of the following statements is correct regarding protons, neutrons, and electrons?

Accepted Answer

Protons and neutrons are found in the nucleus, while electrons orbit the nucleus.

Question 16

Which of the following is the correct formula to calculate the number of neutrons in an atom?

Accepted Answer

$$	ext{Number of neutrons} = 	ext{Mass number} - 	ext{Atomic number}$$

Question 17

Which of the following elements is most abundant in the human body?

Accepted Answer

Oxygen

Question 18

A scientist discovers a new atom with 15 protons, 16 neutrons, and 15 electrons. What is its atomic number and mass number?

Accepted Answer

Atomic number: 15, Mass number: $$15 + 16 = 31$$

Question 19

Which of the following is NOT a property used to organize elements in the periodic table?

Accepted Answer

Number of protons and neutrons combined

Question 20

Which of the following best explains why hydrogen, oxygen, carbon, and nitrogen are essential for life?

Accepted Answer

They form biological compounds like water, proteins, lipids, and nucleic acids.

Chemical Level of Organization: Foundations for Anatomy & Physiology

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