The Structure of the Atom

Identify the two regions of an atom and label them correctly.

• Nucleus and electron region

• Proton and neutron region

• Electron and proton region

• Nucleus and neutron region

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

• atom

• molecule

• proton

• neutron

Which of the following is a very small region located at the center of the atom?

• Electron

• Nucleus

• Proton

• Neutron

The nucleus includes at least one positively charged particle called a ______ and usually one or more neutral particles called ______.

• proton, neutrons

• electron, protons

• neutron, electrons

• proton, electrons

Tags

NGSS.MS-PS1-1

Surrounding the nucleus is a much larger region that contains negatively charged particles called ______.

• electrons

• protons

• neutrons

• positrons

What are the two key terms mentioned in the study resource?

• atom, nuclear forces

• molecule, chemical bonds

• proton, electron cloud

• isotope, valence shell

Tags

NGSS.MS-PS1-1

In the late 1800s, scientists made glass tubes called ______ and filled them with low-pressure gas for their experiments.

• cathode-ray tubes

• vacuum flasks

• test cylinders

• spectrometer tubes

What did scientists discover about the surface of a cathode-ray tube when electric current was passed through it?

• It glowed due to a stream of particles called a cathode ray.

• It remained unchanged.

• It melted.

• It exploded.

Tags

NGSS.MS-PS3-5

Cathode rays could be deflected by a magnet or away from a negatively charged object. What did this suggest about the particles in a cathode ray?

• They are positively charged.

• They are neutral.

• They are negatively charged.

• They are made of light.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Experiments by Joseph John Thomson in 1897 showed that the ratio of the charge of the particles to the mass of the particles in a cathode ray was the same, no matter what metals were used in the cathode and anode.

• True

• False