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Atoms and atomic theory
Atoms and atomic theory
27 terms
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#atoms #atomic theory #subatomic particles
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Answers
1
Refer to the picture. How many protons are in helium (He) atoms?
6
4.00
2
4
2
JJ Thomson discovered that electricity consists of particles we now know are _____
protons
electrons
neutrons
photons
3
According to the picture, how many electrons do helium atoms have?
2
4
6
8
4
an atom that has the same # of protons as others of its kind but different number of neutrons
isotope
mole
photon
electron
5
What is the atomic mass of gold?
79
118
197
196.97
6
An orbital is....
the empty space inside an atom
the approximate location of electrons
the densest region of the nucleus
the exact path an electron travels
7
Which of these subatomic particles has a neutral charge?
electeron
photon
neutron
proton
8
Which of these subatomic particles is very, very tiny compared to the other two?
electron
photon
neutron
proton
9
From which philosopher do we get the term "atoms" from the Greek,
atomos
?
JJ Thomson
Democritus
Aristotle
Ernst Rutherford
10
Which term refers to the mass of one atom?
mass number
atomic mass
atomic symbol
atomic number
11
John Dalton's atomic theory states that all matter is made up of _____ called atoms.
beams of light
positively charged areas
indivisible particles
packets of energy
12
What is the SI unit for the amount of a substance, the number of particles in 12g of carbon-12?
gram
mole
micron
liter
13
Which of the following people discovered electrons?
Aristotle
John Dalton
JJ Thomson
Ernst Rutherford
14
How many protons are in a gold atom?
197
79
196.97
118
15
Which term refers to the number of particles in the nucleus?
atomic mass
atomic symbol
atomic number
mass number
16
Which of these subatomic particles has a positive charge?
neutron
photon
electron
proton
17
What is the term that refers to electrons on the outermost orbitals of an atom?
valence electrons
orbits
photons
nuclei
18
Which of the following individuals gives us the foundation of our modern atomic theory?
Ernst Rutherford
John Dalton
JJ Thomson
Aristotle
19
What is the mass number of gold?
118
197
79
196.97
20
Which of these subatomic particles has a mass approximately the same as a neutron?
proton
electron
photon
neutron
21
Which of these terms represents a "packet of energy"?
proton
neutron
electron
photon
22
Which of these subatomic particles is NOT located within the nucleus?
photons
proton
electrons
neutron
23
How many particles are in the nucleus of a gold atom?
79
197
196.97
116
24
What are the basic units of matter?
mixtures
protons
molecules
atoms
25
Ernst Rutherford's gold foil experiments led to the discovery of ______.
neutrons
protons
electrons
photons
26
How many neutrons are in a gold atom?
79
118
197
196.97
27
Which philosopher gave people the idea that matter consists of earth, air, water, and fire?
Aristotle
Ernst Rutherford
JJ Thomson
Democritus
