Atom Basics Review

Which statement best explains how the mass of an atom is organized?

• Most of the mass is contained in the nucleus.

• The mass is spread evenly throughout the whole atom.

• The mass is spread evenly throughout the electron cloud.

• Most of the mass is contained in the electron cloud.

Roberto creates an animation titled “Flying through an Atom.” The animation makes it seem as if the viewer passes all the way through an atom, starting from one side, then through the atom’s center, and then leaving through the other side.

What is the best description of the order of events in the animation?

• The viewer travels through the electron cloud, then the protons, and then the nucleus.

• The viewer travels through the nucleus, then the electron cloud, and then the nucleus again.

• The viewer travels through the electron cloud, then the neutrons, and then the protons.

• The viewer travels through the electron cloud, then the nucleus, and then the electron cloud again.

Which statement best explains why the overall charge on an atom is zero?

• The positive charge of the neutrons in the nucleus equals the negative charge in the electron cloud.

• The positive charge of the protons in the nucleus equals the negative charge in the electron cloud.

• The negative charge of the neutrons in the nucleus equals the positive charge in the electron cloud.

• The negative charge of the protons in the nucleus equals the positive charge in the electron cloud.

Which is a characteristic of the part of the atom marked "B”?

• It is very dense.

• It has a large mass.

• It is negatively charged.

• It is where neutrons move.

Which is a characteristic of the part of the atom marked "A”?

• It contains most of the mass.

• It is negatively charged.

• It is mostly empty space.

• It is composed of electrons.

Tags

NGSS.MS-PS1-1

How does an atom change if all of its electrons are removed?

• The atom’s volume increases.

• The atom’s mass increases.

• The atom becomes positively charged.

• The atom becomes negatively charged.

What is the main difference between protons and neutrons?

• Protons have a much smaller mass than neutrons.

• Protons have a much larger volume than neutrons.

• Protons have an electrical charge, but neutrons have no charge.

• Protons make up the nucleus, but neutrons orbit around the nucleus.

Students are completing a table about a particular subatomic particle that helps make up an atom. The students have filled in one cell of the table so far.

Based on the information shown, which statement about the subatomic particle must be correct?

• Its location is in the nucleus, because the particle is a proton or a neutron.

• Its location is in the nucleus, because the particle is a neutron or an electron.

• Its charge is +1, because the particle is a proton.

• Its charge is 0, because the particle is a neutron.

Tags

NGSS.MS-PS1-1

What value is closest to the mass of the atom?

• 4 amu

• 6 amu

• 10 amu

• 14 amu

Tags

NGSS.MS-PS1-1

What is an atomic nucleus?

• the outer part of an atom in which electrons move

• the outer part of an atom in which neutrons move

• the central part of an atom, composed of protons and neutrons

• the central part of an atom, composed of protons and electrons