What quantities vary between isotopes of an element?

protons, electrons, and atomic mass

protons, electrons, and atomic number

Rutherford’s gold foil experiment provided evidence for which of the following statements?

There is a dense, positively charged mass in the center of an atom.

Negative and positive charges are spread evenly throughout an atom.

Alpha particles have a positive charge.

Gold is not as dense as previously thought.

Which statement best describes Rutherford’s model of the atom?

It is like a huge stadium with a positively charged marble at the center.

It is like an avocado with the pit representing the nucleus.

It is like an aquarium with swimming fish representing positive charges.

It is like a fried egg with the yolk representing the nucleus.

Which statement about subatomic particles is NOT true?

Protons and neutrons have the same charge.

Protons and neutrons have almost the same mass.

Protons and electrons have opposite charges.

Unlike protons and electrons, neutrons have no charge.

To find the number of neutrons in an atom, you would subtract

atomic number from mass number.

mass number from atomic number.

atomic number from electron number.

isotope number from atomic number.

In Niels Bohr’s model of the atom, electrons move

like balls rolling down a hill.

like popcorn in a popcorn popper.

like beach balls on water waves.

How was Bohr’s atomic model similar to Rutherford’s model?

It described a nucleus surrounded by a large volume of space.

It assigned energy levels to electrons.

It described electron position in terms of the electron cloud model.

It described how electrons gain or lose energy.

What can you assume has happened if an electron moves to a higher energy level?

The electron has gained energy.

The atom has become more stable.

Which statement about electrons and atomic orbitals is NOT true?

An electron has the same amount of energy in all orbitals.

An orbital can contain a maximum of two electrons.

An electron cloud represents all the orbitals in an atom.

An atom’s lowest energy level has only one orbital.

What is the difference between an atom in the ground state and an atom in an excited state?

The atom in an excited state has more energy and is less stable than the atom in the ground state.

The atom in the ground state has less energy and is less stable than the atom in an excited state.

The atom in an excited state has one fewer electron than the atom in the ground state.

The atom in an excited state has one more electron than the atom in the ground state.

What is the difference between an atom in the ground state and an atom in an excited state?

The atom in an excited state has more energy and is less stable than the atom in the ground state.

The atom in the ground state has less energy and is less stable than the atom in an excited state.

The atom in an excited state has one fewer electron than the atom in the ground state.

The atom in an excited state has one more electron than the atom in the ground state.

Chapter Four - Structure of an Atom

Authored by Joe Jahnz

Chemistry

9th Grade

81 Questions

NGSS covered

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MULTIPLE CHOICE QUESTION

neutron

proton

electron

nucleus

the extremely small, positively charged, dense center of an atom that contains positively charge protons and neutral neutrons

nucleus

protons

electron

neutron

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Chapter Four - Structure of an Atom

the smallest particle of an element that retains all the properties of that element; is electrically neutral, spherically shaped and composed of electrons, protons, and neutrons

the number of protons in an atom

a negatively charged, fast-moving particle with an extremely small mass that is found in all forms of matter and moves through the empty space surrounding an atom's nucleus

atoms of the same element with different numbers of neutrons

the number after an element's name, representing the sum of its protons and neutrons

a neutral, subatomic particle in an atom's nucleus that has a mass nearly equal to that of a proton

the extremely small, positively charged, dense center of an atom that contains positively charge protons and neutral neutrons

a subatomic particle in an atom's nucleus that has a positive charge of 1+

Who was the first person to study atomic theory?

What quantities vary between isotopes of an element?

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