Atom Quiz

What is the smallest unit of an element that retains the properties of that element?

• molecule

• atom

• organism

• cell

Answer explanation

The smallest unit of an element that retains its properties is an atom. Atoms are the building blocks of matter and cannot be broken down further.

Tags

NGSS.MS-PS1-1

What are the three subatomic particles that make up an atom?

• alpha particles, beta particles, and gamma rays

• photons, neutrinos, and positrons

• protons, neutrons, and electrons

• quarks, leptons, and bosons

Answer explanation

An atom is made up of protons, neutrons, and electrons. These three subatomic particles are responsible for the structure and properties of an atom.

What is the center of an atom called, where the protons and neutrons are located?

• hub

• core

• center

• nucleus

Answer explanation

The center of an atom, where the protons and neutrons are located, is called the nucleus. It is the correct choice.

What is the atomic number of an element?

• The atomic number of an element is the number of neutrons in the nucleus of an atom.

• The atomic number of an element is the number of electrons in the nucleus of an atom.

• The atomic number of an element is the number of protons in the nucleus of an atom.

• The atomic number of an element is the number of isotopes in the nucleus of an atom.

Answer explanation

The atomic number of an element is the number of protons in the nucleus of an atom. It determines the element's identity and position in the periodic table.

What is the total number of protons and neutrons in an atom called?

• Isotope number

• Electron number

• Mass number

• Atomic number

Answer explanation

The total number of protons and neutrons in an atom is called the mass number. It helps determine the atom's atomic mass.

Which subatomic particle has a positive charge?

• Proton

• Quark

• Electron

• Neutron

Answer explanation

The subatomic particle with a positive charge is the proton. It is one of the fundamental particles of an atom and is located in the nucleus.

Which subatomic particle has a negative charge?

• electron

• photon

• neutron

• proton

Answer explanation

The subatomic particle with a negative charge is the electron. It is one of the fundamental particles of matter.

What is the mass of an atom primarily made up of?

• Electrons and protons

• Protons and neutrons

• Neutrons and electrons

• Protons and electrons

Answer explanation

The mass of an atom is primarily made up of protons and neutrons.

What is the charge of an atom when it has an equal number of protons and electrons?

• Negative

• Fractional

• Neutral

• Positive

Answer explanation

When an atom has an equal number of protons and electrons, it is considered neutral. This means that the positive charge of the protons is balanced by the negative charge of the electrons, resulting in no overall charge.

What is the term for the number of protons in the nucleus of an atom?

• atomic number

• proton quantity

• elemental mass

• nuclear count

Answer explanation

The term for the number of protons in the nucleus of an atom is called the atomic number. It is a fundamental property of an element.

Tags

NGSS.HS-PS1-8