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Physical Science BJU Chapter 3 Flashcards | StudBud
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Physical Science BJU Chapter 3
Physical Science BJU Chapter 3
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1
Potassium -39 and potassium -41 always have the same number of ___________.
electrons
protons
all of the above
neutrons
2
Which of the following is NOT a reason that the Bohr model is still in widespread use today?
its the most workable model to date
it is simple and easy to understand
its useful for showing how chemical bonding works
it represents energy levels in a visual way
3
Ernest Rutherford developed the Saturnian Model
False
True
4
Current atomic models show that electrons travel in distinct , spherical orbits around the nucleus.
False
True
5
____________ discovered electrons using Crookes tubes
JJ Thompson
Ernest Rutherford
Niels Bohr
John Dalton
6
___________believed that electrons move through spherical regions located a fixed distance from the nucleus.
Niels Bohr
JJ Thompson
Democritus
Ernest Rutherford
7
Experiments involving ___________ lead to the discovery of the nucleus.
alpha particles and gold foil
crooks tube
chemical reactions of gases
emission spectrum
8
The number of protons found in the nucleus of a given element.
atomic number
unified atomic mass unit
mass number
atomic mass
9
With which of these statements would John Dalton have disagreed?
atoms cannot be created or destroyed in chemical reactions
atoms can de divided into protons, neutrons and electrons
elements are made only of atoms
atoms of a element are all alike
10
Which of the following is a weighted average?
atomic number
none of these
mass number
atomic mass
11
Democritus suggested that matter
existed in the form of very small, indivisible particles
could be subdivided an unlimited number of times
was made of hard spherical atoms surrounded by heat envelopes
was continuous
12
Quantum mechanics is a branch of physics that deals with __________.
laws fo motion
gravitational force
matter and energy at atomic and subatomic levels
classical physics
13
This subatomic particle is found in the nucleous and has no electrical charge
neutron
proton
electron
14
the total number of particles found in the nucleus of a given element
mass number
unified atomc mass unit
atomic mass
atomic number
15
Most of an atom consists of filled space
False
True
16
John Dalton thought that atoms are indivisible and cannot be destroyed.
False
True
17
The quantum mechanical model is not the primary model used today by scientists.
True
False
18
Quantum Mechanics deals with the behavior of matter and energy at the atomic and subatomic levels.
True
False
19
An anion has more ____________ than ______
electrons, neutrons
neutrons, protons
electrons, protons
protons, electrons
20
An atom with more protons than electrons is called a
cation
ion
atom
anion
21
The Bohr Model suggests that electrons move
in a flat ring around a massive, positively charged center
rapidly throughout a uniform, positively charged matrix
only in distinct, spherical orbits at fixed distances from the nucleus
randomly about the nucleus
22
What is the currently accepted model of the atom?
the nuclear model
the subatomic model
the quantum mechanical model
the Bohr Model
23
The subatomic particel has a charge of +1e
electron
proton
neutron
24
Carbon -14 and Carbon -12 have different numbers of neutrons.
False
True
25
Which of the following is NOT typically represented with a whole number?
all of the choices are whole numbers
atomic mass
atomic number
mass number
26
What is JJ Thomson's atomic model called?
the saturanian model
the nuclear model
the quantum mechanical model
the plum pudding model
27
_______________ first suggested that elements are made of atoms and that atoms of an element are alike
niels bohr
democritus
ernest rutherford
john dalton
28
Aristotle first called particles atomos, from which we get our word atom.
True
False
29
_____________ developed the nuclear model
democritus
Ernest Rutherford
none of the above
Hantaro Nagaoka
30
The law of electrostatic charges states that
both a & b are true
opposite electric charges attract each other
like electric charges repel each other
neither a nor b are true
31
This Subatomic particle has a charge of -1e
proton
electron
neutron
32
JJ Thomson discovered the existence of the _____________.
atom
neutron
proton
electron
