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.

Identify the correct sketch of the plum pudding model proposed by Thomson, labeling the electrons and the region of positive charge.

A diagram showing electrons embedded in a sphere of positive charge, with electrons and positive region labeled.

A diagram showing electrons orbiting a nucleus, with protons and neutrons labeled.

A diagram showing a nucleus at the center with electrons in shells, with only electrons labeled.

A diagram showing only positive charges scattered randomly, with no electrons labeled.

What is the nucleus of an atom?

The nucleus is the small, dense, positively charged center of an atom.

The nucleus is the outermost shell of an atom.

The nucleus is the region where electrons are found orbiting.

The nucleus is the negatively charged part of an atom.

Define each of the following: a. atom

An atom is the smallest unit of an element that retains the properties of that element.

An atom is a large molecule made up of several elements.

An atom is a type of chemical reaction.

An atom is a device used to measure mass.

Define each of the following: b. neutron

A neutron is a subatomic particle found in the nucleus of an atom that has no electric charge and a mass slightly greater than that of a proton.

A neutron is a positively charged particle found outside the nucleus of an atom.

A neutron is a negatively charged particle that orbits the nucleus of an atom.

A neutron is an energy level within an atom where electrons are likely to be found.

Describe one conclusion made by each scientist that led to the development of the current atomic theory. a. Thomson

Thomson concluded that atoms contain negatively charged particles called electrons.

Thomson concluded that atoms are indivisible and cannot be broken down further.

Thomson concluded that atoms are made only of positive charges.

Thomson concluded that atoms do not contain any subatomic particles.

Describe one conclusion made by each scientist that led to the development of the current atomic theory. b. Millikan

Millikan determined the charge of the electron through his oil-drop experiment.

Millikan discovered the neutron in the atomic nucleus.

Millikan proposed the planetary model of the atom.

Millikan identified the proton as a fundamental particle.

Describe one conclusion made by each scientist that led to the development of the current atomic theory.

Rutherford concluded that atoms have a small, dense, positively charged nucleus.

Rutherford concluded that electrons are found in fixed orbits around the nucleus.

Rutherford concluded that atoms are indivisible and indestructible.

Rutherford concluded that atoms contain negatively charged particles called neutrons.

Compare the three subatomic particles in terms of location in the atom, mass, and relative charge.

Protons are located in the nucleus, have a positive charge, and a mass of 1 amu. Neutrons are also in the nucleus, have no charge, and a mass of 1 amu. Electrons are found outside the nucleus, have a negative charge, and a negligible mass.

Protons are found outside the nucleus, have a negative charge, and a mass of 1 amu. Neutrons are in the nucleus, have a positive charge, and a mass of 0 amu. Electrons are in the nucleus, have no charge, and a mass of 1 amu.

Protons are in the nucleus, have no charge, and a mass of 0 amu. Neutrons are outside the nucleus, have a positive charge, and a mass of 1 amu. Electrons are in the nucleus, have a negative charge, and a mass of 1 amu.

Protons are outside the nucleus, have a positive charge, and a negligible mass. Neutrons are in the nucleus, have a negative charge, and a mass of 1 amu. Electrons are in the nucleus, have no charge, and a mass of 1 amu.

What is it about the composition of the nucleus that requires the concept of nuclear forces?

The nucleus contains positively charged protons that would naturally repel each other due to electrostatic forces. Nuclear forces are required to overcome this repulsion and hold the protons and neutrons together.

The nucleus contains only neutrons, which do not interact with each other, so nuclear forces are needed to create any interaction.

The nucleus is made up of electrons and protons, and nuclear forces are needed to keep electrons inside the nucleus.

The nucleus is unstable due to the presence of only protons, so nuclear forces are needed to add electrons to stabilize it.

The Structure of the Atom

Authored by David Burdrick

Chemistry

11th Grade

95 Questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

atom

molecule

proton

neutron

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

Electron

Nucleus

Proton

Neutron

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

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

electrons

protons

neutrons

positrons

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

atom, nuclear forces

molecule, chemical bonds

proton, electron cloud

isotope, valence shell

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

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The Structure of the Atom

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

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

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

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

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

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

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

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

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?

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.

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

The Structure of the Atom

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

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

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

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

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

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

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

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

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?

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.

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

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