# MCQ On Elements And Atomic Structure! Trivia Quiz

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How good are you with the chemical elements, their atomic structure, and atomic number? Would you be able to pass this quiz? Regarding this quiz, you should know what an atomic number is, which element is number 12, what is discovered in the nucleus, the volume and mass of an atom, and what is isotopes. This outstanding quiz is all about elements and atomic structure. All the best.

• 1.

### Atomic number is ______________

• A.

Proton number

• B.

Mass number

• C.

Subscript

• D.

Electron number

• E.

None of the above

A. Proton number
Explanation
The atomic number is the number of protons in an atom's nucleus. It determines the element's identity and its position on the periodic table. The other options mentioned in the question, such as mass number, subscript, and electron number, are not equivalent to the atomic number. The mass number is the sum of protons and neutrons, the subscript indicates the number of atoms in a molecule, and the electron number refers to the number of electrons in an atom. Therefore, the correct answer is "Proton number."

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• 2.

### You learn that an element has a mass number of 12. What element is it?

• A.

Hydrogen

• B.

Magnesium

• C.

Carbon

• D.

Oxygen

• E.

Cannot be determined

E. Cannot be determined
Explanation
The mass number of an element is the sum of its protons and neutrons. Since the question only provides the mass number and does not specify the number of protons or neutrons, it is impossible to determine the element based solely on the given information.

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• 3.

### All of the following are found in the nucleus EXCEPT ______.

• A.

Protons

• B.

Neutrons

• C.

Electrons

• D.

Attomic number

• E.

A and B

C. Electrons
Explanation
The nucleus is the central part of an atom that contains protons and neutrons. Electrons, on the other hand, are found in the electron cloud surrounding the nucleus. Therefore, electrons are not found in the nucleus, making them the correct answer.

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• 4.

### The volume of an atom consists mostly of ______, and the mass of an atom is accounted for mostly by ______.

• A.

Protons and neutrons; empty space

• B.

Empty space; protons and neutrons

• C.

Protons and neutrons; electrons

• D.

Empty space; electrons

• E.

None of the above

B. Empty space; protons and neutrons
Explanation
The volume of an atom consists mostly of empty space because the electrons, which are negatively charged particles, occupy a relatively large amount of space compared to the size of the nucleus. On the other hand, the mass of an atom is accounted for mostly by protons and neutrons, which are located in the nucleus. These particles have a much higher mass compared to electrons. Therefore, the correct answer is "empty space; protons and neutrons."

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• 5.

### The atomic mass of an element is a whole number.

• A.

True

• B.

False

B. False
Explanation
The atomic mass of an element is not always a whole number. It is the average mass of all the isotopes of that element, taking into account their relative abundance. Isotopes are atoms of the same element with different numbers of neutrons, which can result in different atomic masses. Therefore, the atomic mass of an element can be a decimal number.

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• 6.

### Isotopes have the same atomic numbers, but different mass numbers.

• A.

True

• B.

False

A. True
Explanation
Isotopes are atoms of the same element that have the same number of protons (atomic number), but different numbers of neutrons (mass number). This means that isotopes have the same chemical properties but differ in their atomic mass. Therefore, the statement that isotopes have the same atomic numbers but different mass numbers is true.

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• 7.

### The nucleus of an atom takes up most of its volume and accounts for most of its mass.

• A.

True

• B.

False

B. False
Explanation
The statement is false because the nucleus of an atom is actually very small compared to the overall size of the atom. The nucleus is located at the center of the atom and contains protons and neutrons, which are responsible for most of the atom's mass. However, the volume of the nucleus is extremely small compared to the volume of the entire atom, which is mostly made up of the electron cloud surrounding the nucleus.

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• 8.

### Isotopes are represented by the mass number written as a superscript and atomic number as a subscript written next to the element's chemical symbol.

• A.

True

• B.

False

A. True
Explanation
This statement is true because isotopes are variants of an element that have the same number of protons but different numbers of neutrons. The mass number represents the total number of protons and neutrons in the nucleus of an atom, and it is written as a superscript next to the element's chemical symbol. The atomic number represents the number of protons in the nucleus, and it is written as a subscript next to the element's chemical symbol. Therefore, this statement accurately describes how isotopes are represented.

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• 9.

### The number of neutrons in an atom can be calculated by subtracting the atomic number from the mass number.

• A.

True

• B.

False

A. True
Explanation
The statement is true because the mass number of an atom represents the total number of protons and neutrons in its nucleus, while the atomic number represents the number of protons. By subtracting the atomic number from the mass number, we can determine the number of neutrons.

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• 10.

### Isotopes have the same number of protons and neutrons but differ in their number of electrons.

• A.

True

• B.

False

B. False
Explanation
Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. They do not differ in their number of electrons. The number of protons determines the element's identity, while the number of neutrons affects the atom's mass. Therefore, isotopes have the same number of protons and electrons but differ in their number of neutrons.

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• Current Version
• Mar 22, 2023
Quiz Edited by
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• Nov 07, 2009
Quiz Created by
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