Quiz 2 2/14

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

• Proton

• Electron

• Atom

• Neutron

Answer explanation

The smallest unit of an element that retains its chemical properties is an atom. It consists of protons, neutrons, and electrons.

Which of the following elements is an example of a halogen?

• Oxygen

• Chlorine

• Iron

• Carbon

Answer explanation

Chlorine is an example of a halogen. It is a highly reactive nonmetal and is commonly used in disinfectants and bleach.

What is the atomic number of an element based on?

• The number of electrons

• The number of protons

• The number of neutrons

• The number of isotopes

Answer explanation

The atomic number of an element is based on the number of protons. Protons determine the element's identity and are unique to each element.

What two subatomic particles make the atomic mass number?

• The number of electrons

• The number of protons

• The number of neutrons

• The number of isotopes

Answer explanation

The atomic mass number is determined by the combined mass of protons and neutrons in an atom.

Which subatomic particle is responsible for the chemical behavior of an element?

• Electron

• Proton

• Neutron

• Isotope

Answer explanation

The electron is responsible for the chemical behavior of an element. It determines the element's reactivity and bonding properties.

The atomic mass of an element is primarily determined by the combined mass of which subatomic particles?

• Electrons and protons

• Electrons and neutrons

• Protons and neutrons

• Electrons, protons, and neutrons

Answer explanation

The atomic mass of an element is primarily determined by the combined mass of protons and neutrons. Electrons have negligible mass compared to protons and neutrons.

Which of the following elements has the highest atomic number?

• Hydrogen (H)

• Helium (He)

• Lithium (Li)

• Neon (Ne)

Answer explanation

Neon (Ne) has the highest atomic number among the given elements.

Which element has an atomic number of 6?

• Carbon (C)

• Oxygen (O)

• Nitrogen (N)

• Hydrogen (H)

Answer explanation

The element with an atomic number of 6 is Carbon (C). It is the correct choice because Carbon has an atomic number of 6.

What does the term "isotope" refer to?

• Atoms of different elements with the same atomic number

• Atoms of the same element with different numbers of protons

• Atoms of the same element with different numbers of neutrons

• Atoms of different elements with the same atomic mass

Answer explanation

Isotopes are atoms of the same element with different numbers of neutrons, distinguishing them from atoms of different elements with the same atomic number or atomic mass.

What is the mass number of an atom that has 7 protons, 7 neutrons, and 7 electrons?

• 7

• 14

• 21

• 28

Answer explanation

The mass number of an atom is the sum of the number of protons and neutrons. In this case, the atom has 7 protons and 7 neutrons, so the mass number is 14. Therefore, the correct answer is 14.