Suppose an atom has a mass number of 23. Which statement is true beyond any doubt?

The number of protons in the nucleus does not equal the number of neutrons

Which statement about subatomic particles is NOT true

Protons and neutrons have the same charge.

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

Which statement about subatomic particles is true

Neutrons have no charge and no mass

Which statement accurately represents the arrangement of electrons in Bohr’s atomic model

Electrons travel nucleus fixed energy levels energies that vary from level

J. J. Thomson’s experiments provided evidence that an atom a

contains negatively charged particles

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

atomic number from mass number.

Which of the following most accurately represents John Dalton’s model of the atom

a tiny, solid sphere with an unpredictable mass for a given element

According to John Dalton’s observations, when elements combine in a compound,

the ratio of their masses is always the same.

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

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

model shows the results of Rutherford’s gold foil experiment. What caused some of the alpha particles to bounce straight

negative charges in the gold atoms

Democritus thought that matter was made of tiny particles

of earth, air, fire, and water.

what does the electron cloud model describe?

The most likely locations of electrons in atoms

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

A compound contains atoms of more than one element

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

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

In an atomic model that includes a nucleus, positive charge is

concentrated in the center of an atom

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

The atom has become more stable.

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Answers

1
The Greek philosopher Democritus coined what word for a tiny piece of matter that cannot be divided?
atom
molecule
element
electron
2
Suppose an atom has a mass number of 23. Which statement is true beyond any doubt?
The atomic number is less than 11
The atom has an odd number of neutronsa.
The atom is not an isotope
The number of protons in the nucleus does not equal the number of neutrons
3
Who provided evidence for the existence of a nucleus in an atom?
Ernest Rutherford
Democritus
John Dalton
J. J. Thomson
4
What do scientists use to predict the locations of electrons in atoms
geometry
ratios and proportions
algebra
probability
5
Which statement about subatomic particles is NOT true
Protons and neutrons have the same charge.
Protons and neutrons have almost the same mass.
Unlike protons and electrons, neutrons have no charge
Protons and electrons have opposite charges
6
Rutherford’s gold foil experiment provided evidence for which of the following statements?
Gold is not as dense as previously thought
Negative and positive charges are spread evenly throughout an atom
There is a dense, positively charged mass in the center of an atom
Alpha particles have a positive charge.
7
Which statement about subatomic particles is true
An electron has far less mass than either a proton or neutron.
Neutrons have no charge and no mass
Unlike protons or neutrons, electrons have no mass
Protons, neutrons, and electrons all have about the same mass
8
Which statement accurately represents the arrangement of electrons in Bohr’s atomic model
Electrons travel nucleus fixed energy levels with equal amounts of energy.
Electrons travel nucleus fixed energy levels energies that vary from level
Electrons travel nucleus fixed energy levels with equal amounts of energy
Electrons vibrate in fixed locations around the nucleus
9
If 2 grams element X combined 4 grams of element y form compound XY how many grams element Y would combine 14 grams of X
14 grams
7 grams
21 grams
28 grams
10
Which of the following is unique for any given element?
the number of neutrons
the mass of a neutron
the number of protons
the charge on the electrons
11
J. J. Thomson’s experiments provided evidence that an atom a
has a positive charge.
is the smallest particle of matter
contains negatively charged particles
has a negative charge.
12
In Niels Bohr’s model of the atom, electrons move
ike popcorn in a popcorn popper
like beach balls on water waves
like balls rolling down a hill.
like planets orbiting the sun.
13
To find the number of neutrons in an atom, you would subtract
mass number from atomic number.
atomic number from mass number.
atomic number from electron number
isotope number from atomic number
14
Which of the following most accurately represents John Dalton’s model of the atom
a sphere that is hollow throughout
a hollow sphere with a dense nucleus
a tiny, solid sphere with an unpredictable mass for a given element
a tiny, solid sphere with a predictable mass for a given elemen
15
According to John Dalton’s observations, when elements combine in a compound,
their masses are always equal
each element contributes an equal number of atoms.
their volumes are always equal.
the ratio of their masses is always the same.
16
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.
17
model shows the results of Rutherford’s gold foil experiment. What caused some of the alpha particles to bounce straight
negative charges in the gold atoms
other alpha particles
nuclei in the gold atoms
electrons in the gold atoms
18
Democritus thought that matter was made of tiny particles
that were all round and smooth
that could be divided
of earth, air, fire, and water.
that could not be divided.
19
what does the electron cloud model describe?
the number of electrons in an atom
the precise locations of electrons in atoms
the mass of the electrons in an atom
The most likely locations of electrons in atoms
20
Which of the following is NOT part of John Dalton’s atomic theory
A compound contains atoms of more than one element
All elements are composed of atoms.
Atoms contain subatomic particles.
All atoms of the same element have the same mass
21
Which statement best describes Rutherford’s model of the atom?
It is like a fried egg with the yolk representing the nucleus.
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.
22
In an atomic model that includes a nucleus, positive charge is
located in the space outside the nucleus.
spread evenly throughout an atom
concentrated at multiple sites in an atom.
concentrated in the center of an atom
23
Which subatomic particle has a negative charge?
proton
alpha particle
electron
neutron
24
What can you assume has happened if an electron moves to a higher energy level
The electron has gained energy
The electron has lost energy.
The atom has become more stable.
The atom has lost an electron.
25
The number of protons in one atom of an element is that element’s
mass number.
isotope.
atomic number
balanced charge

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