2.1: The Nature of Matter

Fill in the blank: Protons and neutrons are found in the nucleus of atoms. Protons are ________ charged. Neutrons are ________.

• positively; neutral

• negatively; positive

• neutral; negatively

• negatively; neutral

Tags

NGSS.HS-PS1-8

Fill in the blank: Electrons are ________ charged and surround the nucleus.

• negatively

• positively

• neutrally

• magnetically

Fill in the blank: Isotopes are atoms of the same element that have different numbers of ________.

• neutrons

• protons

• electrons

• quarks

Tags

NGSS.HS-PS1-8

Fill in the blank: Radioactive isotopes are isotopes with nuclei that break down at a constant ________ over time.

• rate

• temperature

• pressure

• volume

Tags

NGSS.HS-PS1-8

Fill in the blank: Chemical compounds are formed by two or more elements in definite proportions to create a new ________.

• substance

• atom

• mixture

• element

Fill in the blank: In ionic bonds, electrons are transferred from one atom to another to ________ bond them together.

• chemically

• physically

• magnetically

• mechanically

Tags

NGSS.HS-PS1-1

Fill in the blank: In covalent bonds, electrons are ________ between two atoms to bond them together.

• shared

• transferred

• repelled

• destroyed

Tags

NGSS.HS-PS1-1

Fill in the blank: Weak interactions are brief interactions between molecules such as ________ forces and hydrogen bonds.

• van der Waals

• covalent

• ionic

• metallic

The three subatomic particles that make up atoms are:

• Protons, neutrons, and electrons

• Protons, photons, and electrons

• Neutrons, electrons, and positrons

• Electrons, protons, and quarks

All of the isotopes of an element are similar because:

• they have the same number of protons.

• they have the same number of neutrons.

• they have the same mass number.

• they have different chemical properties.