Which statement about an element's average atomic mass is correct?

It is a weighted percent average

Which of the following is not true

Neutrons have a negative charge.

What did Rutherford conclude about the structure of the atom

An atom contains a small dense positively charged center

An atom's mass number equals the number of....

Protons plus the number of neutrons.

Bohr's theory helped explain

excited hydrogen gas gives off certain colors of light

Compared to the entire atom, the nucleus of the atom is

smaller and contains most of the atom's mass

Atoms have no electric charge because they

Have an equal number of electrons and protons.

The nucleus of most atoms is composed of

tightly packed protons and neutrons

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Atomic Structure and History

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Atomic structure and history of the atom quiz.

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Questions 16

Answers

1
If electrons in an atom have the lowest possible energies, the electrons are in their
radiation-emitting states
ground state
excited states
inert states
2
Most of the volume of an atom is occupied by the
protons
nucleus
nuclides
electron cloud
3
Which statement about an element's average atomic mass is correct?
It is 1/12 the mass of the common isotope.
It is a weighted percent average
It is based on an isotope's charge.
It is determined by counting the number of isotopes
4
Experiments with cathode rays led to the discovery of the
nucleus
electron
neutron
proton
5
Which of the following is not true
Neutrons have no charge
A nucleus has a positive charge
Neutrons have a negative charge.
Protons have a positive charge
6
What did Rutherford conclude about the structure of the atom
Electrons make up the center of an atom
An atom contains a small dense positively charged center
An atom is indivisible
An atom carries a positive charge
7
An atom's mass number equals the number of....
Protons
Protons plus the number of neutrons.
Neutrons
protons plus the number of electrons.
8
Bohr's theory helped explain
Electrons have negative charges
excited hydrogen gas gives off certain colors of light
Most od the mass of the atom is in the nucleus
atoms combine to form molecules
9
Who explained the behavior of positively charged particles being deflected from a metal foil?
Niels Bohr
Ernest Rutherford
James Chadwick
John Dalton
10
Compared to the entire atom, the nucleus of the atom is
smaller and contains most of the atom's mass
larger and contains little of the atom's mass
larger and contains most of the atom's mass
small and contains little of the atom's mass
11
Who first proposed and atomic theory based on scientific knowledge?
Dimitri Mendeleev
Robert Brown
Jons Berzelius
John Dalton
12
A nuclear particle that has about the same mass as a proton but with a charge is called
nuclide
neutron
electron
isotope
13
Atoms have no electric charge because they
Have an equal number of electrons and protons.
Have an equal number of charged and non-charged particles.
Have an equal number of neutrons and protons.
Have neutrons in their nuclei.
14
The nucleus of most atoms is composed of
loosely connected protons and electrons
tightly packed neutrons
tightly packed protons and neutrons
tightly packed protons
15
Atoms of the same element that have different masses are called
nuclides
moles
isotopes
neutrons
16
For an electron in an atom to change from the ground state to an excited state
energy must be absorbed
radiation must be emitted
energy must be released
the electron transitions from higher to lower energy

Atomic Structure and History Flashcards | StudBud