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Honors Chemistry Chapter 4 Flashcards | StudBud
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Honors Chemistry Chapter 4
Honors Chemistry Chapter 4
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1
Which element has an average atomic mass of 15.999 amu?
helium
phosphorus
calcium
oxygen
2
What is the primary factor in determining an atom's stability?
proton to electron ratio
neutron to electron ratio
neutron to proton ratio
alpha particle to beta particle ratio
3
What particles account for most of an atom's mass?
electrons & quarks
protons & neutrons
protons & electrons
neutrons & electrons
4
What is the mass number of the Dy-139 isotope?
139
300
120
66
5
How many protons are in the Al-28 isotope?
28
13
3
14
6
What is the name for the emission of rays and particles by a substance?
radioactive series
nuclear reactivity
radiation
nuclear stability
7
Who found that almost all of an atom's mass is in its nucleus?
Dalton
Democritus
Thomson
Rutherford
8
Atoms with the same number of protons but different numbers of neutrons are called
isotopes
gamma rays
beta particles
atoms
9
Why are beta particles deflected more than alpha particles in an electric field?
β are much larger than α
β have more energy than α
β are much smaller than α
b and α are oppositely charged
10
what is the number of protons in the nucleaus of an atom?
electrons
isotopes
Mass number
Atomic number
11
The sum of protons and neutrons in a nucleus is
the atomic number
Avogadro's number
the mass number
the element number
12
Democritus believed that matter was made up of
fire
atoms
Earth
water
13
Which element has an atomic number of 51?
antimony(Sb)
tin( Sn)
indium(In)
boron (B)
14
Aristotle said ___________________ could not exist.
air
atoms
empty space
fire
15
What theory had the idea that all elements are composed of tiny indivisible particles
Dalton's atomic theory
Democritus philosophy
Rutherford's theory
J.J thompson's theory
16
How many electrons are in the F-19 isotope?
10
19
9
38
17
In the Plum Pudding model, where is the positive charge located?
in the electrons
evenly distributed throughout the atom
in the protons
in the nucleus
18
What is the atomic number of the Na-23 isotope?
24
23
11
14
19
How many protons are in the Zn-64 isotope?
30
128
32
64
20
An isotope has an atomic number of 22 and has 33 neutrons. What is the mass number?
55
33
12
22
21
True or False: Atomic Number = Number of Protons = Number of Electrons
FALSE
TRUE
22
The atomic number of an element is defined by its number of
electrons
protons
nuclei
neutrons
