Q: Which of the following is the correct formula for calculating the number of neutrons in an atom?

$$\text{Number of Neutrons} = \text{Mass Number} - \text{Atomic Number}$$

Question 1

Which of the following best describes the relationship between atoms, elements, and matter as illustrated in the provided image?

Accepted Answer

Matter is composed of elements, which are made up of atoms.

Question 2

Based on the atomic structure shown in the images, which subatomic particle is responsible for the chemical identity of an element?

Accepted Answer

Proton

Question 3

Referencing the periodic table images, which group of elements makes up approximately 97% of the mass of most living organisms?

Accepted Answer

CHNOPS: Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur

Question 4

If a carbon atom has 6 protons and 7 neutrons, what is its mass number? Use the formula $$	ext{Mass Number} = 	ext{Number of Protons} + 	ext{Number of Neutrons}.$$

Accepted Answer

$$13$$

Question 5

Which statement best explains why ice floats on liquid water, as discussed in the study materials?

Accepted Answer

Stable hydrogen bonds keep water molecules of ice farther apart than in liquid water.

Question 6

Which of the following is a property of water that is essential for life and results from hydrogen bonding?

Accepted Answer

Cohesion and adhesion

Question 7

A neutral oxygen atom has an atomic number of 8 and a mass number of 16. How many neutrons does it have? Use the formula $$	ext{Number of Neutrons} = 	ext{Mass Number} - 	ext{Atomic Number}.$$

Accepted Answer

$$8$$

Question 8

Which of the following best describes the difference between a molecule and a compound?

Accepted Answer

A molecule is a substance containing two or more chemically bound atoms, while a compound contains two or more different elements.

Question 9

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 10

Which of the following best explains why neon (Ne) is chemically unreactive?

Accepted Answer

Its valence shell is full of electrons.

Question 11

Which of the following is true about the subatomic particles in an atom?

Accepted Answer

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

Question 12

Which of the following best describes the octet rule as it applies to atoms?

Accepted Answer

Atoms are most stable when their outermost shell contains 8 electrons.

Question 13

Which of the following is a trace element required by living organisms in small amounts?

Accepted Answer

Iron

Question 14

Which of the following statements about the periodic table is correct?

Accepted Answer

Elements are arranged based on their chemical properties and atomic number.

Question 15

Which of the following is the correct formula for calculating the number of neutrons in an atom?

Accepted Answer

$$	ext{Number of Neutrons} = 	ext{Mass Number} - 	ext{Atomic Number}$$

Chemical Principles in Microbiology: Atoms, Elements, and Matter

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