Which is true when all of an atoms electrons are in orbitals with the lowest possible energies?

The electrons are in the most stable configuration., The atom is in its ground state.

Which statement tell's how Bohr's model of the atom differed from Rutherford's model?

Bohr's model focused on the electrons.

Which statement about subatomic particles is NOT true?

Protons and neutrons have the same charge.

Which statement about particles is TRUE?

An electron has far less mass than a proton or a neutron.

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

Atomic number from mass number.

J. J. Thomson's experiments provided evidence that an atom

contains negatively charged particles.

Which expression accurately compares the masses of neutrons and protons?

Mass of 1 neutron = mass of 1 proton

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

It describes a nucleus surrounded by a large volume of space

Which sentence states what Rutherford concluded from the gold foil experiment?

At atom's positive charge is concentrated in it's nucleus.

What does the electron cloud model describe?

The most likely location of electrons in atoms

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

The electron has gained energy.

Which of the following is NOT part of John Dalton's atomic theory?

Atoms contain subatomic particles.

The glowing of a neon light is caused by electrons emitting energy as they

move from higher to lower energy levels.

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Atomic Structure & Theory

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Atomic Structure Review #ICP #9th10thgrade #atoms

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Questions 24

Answers

1
Which is true when all of an atoms electrons are in orbitals with the lowest possible energies?
The electrons are in an unstable configuration.
The electrons are in the most stable configuration.
The atom is in an excited state.
The atom is in its ground state.
2
Who provided evidence for the existence of a nucleus in an atom?
Ernest Rutherford
Democritus
John Dalton
J. J. Thomson
3
Which statement tell's how Bohr's model of the atom differed from Rutherford's model?
Bohr's model focused on the protons.
Bohr's model focused on the electrons.
Bohr's model focused on the neutrons.
Bohr's model focused on the nucleus.
4
Which statement about subatomic particles is NOT true?
Neutrons have no charge.
Protons and neutrons have almost the same mass.
Protons and electrons have opposite charges.
Protons and neutrons have the same charge.
5
Which statement about particles is TRUE?
An electron has far less mass than a proton or a neutron.
Neutrons have no charge and no mass.
Protons, neutrons & electrons all have about the same mass.
Electrons have no mass.
6
Democritus thought that matter was made of tiny particles
that were all round and smooth.
of earth, air, fire, and water.
that could be divided.
that could not be divided.
7
To find the number of neutrons in an atom, you would subtract
Isotope number from atomic number.
Mass number from atomic number.
Atomic number from mass number.
Atomic number from electron number.
8
J. J. Thomson's experiments provided evidence that an atom
is the smallest particle of matter.
contains negatively charged particles.
has a negative charge.
has a positive charge.
9
Which expression accurately compares the masses of neutrons and protons?
Mass of 1 neutron = mass of 1 electron
Mass of 1 neutron = mass of 1 proton
Mass of 1 electron = mass of 1 proton
Mass of 2000 neutron = mass of 1 proton
10
How was Bohr's atomic model similar to Rutherford's model?
It describes a nucleus surrounded by a large volume of space
It describes electron position by using electron cloud model
It assigned energy levels to electrons.
It described how electrons gain or lose energy.
11
Which sentence states what Rutherford concluded from the gold foil experiment?
The atom's positive charge is spread evenly about the atom.
At atom's positive charge is concentrated in it's nucleus.
An atoms negative charge is concentrated in it's nucleus.
Thomson's model of the atom was correct.
12
What does the electron cloud model describe?
The number of electrons in atoms
The mass of the electrons in an atom
The precise location of electrons in atoms
The most likely location of electrons in atoms
13
Which subatomic particle has a negative charge?
Proton
Alpha particle
Neutron
Electron
14
Democritus coined this word for a tiny piece of matter that cannot be divided
molecule
electron
atom
element
15
Which element has 3p³ as the last step in its configuration?
Al
P
S
Ne
16
In Niels Bohr's model of the atom, electrons move
like planets orbiting the Sun.
like popcorn in a popcorn popper.
like beach balls on water waves.
like balls rolling down a hill.
17
The number of protons in one atom of an element is that element's
balanced charge.
mass number.
atomic number.
isotope.
18
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.
The electron has lost energy.
The atom has lost an electron.
19
Which of the following is NOT part of John Dalton's atomic theory?
All atoms of the same element have the same mass.
A compound contains atoms of more than one element.
All elements are composed of atoms.
Atoms contain subatomic particles.
20
The glowing of a neon light is caused by electrons emitting energy as they
collide with the nucleus.
collide with other electrons.
move from higher to lower energy levels.
move from lower to higher energy levels.
21
Which statement is true about oxygen-17 and oxygen-18?
They have the same mass number.
They are isotopes of oxygen.
They do not have the same number of protons.
Their atoms have an identical mass.
22
Which of these is always equal to the element's atomic number?
Number of electrons
Number of protons
Number of neutrons
Number of nuclei
23
What do scientists use to predict the locations of electrons in atoms?
Algebra
Geometry
Ratios and proportions
Probability
24
Which of the following is unique for any given element?
Mass of a neutron
Number of protons
Charge on the electrons
Number of neutrons

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