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Atomic mass
Electrons _____ the nucleus.
What is the mass number?
Atomic mass
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atomic number and atomic mass
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Questions
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Answers
1
What is the mass number?
neutrons and electrons
protons and neutrons
electrons and atoms
protons and electrons
2
Electrons _____ the nucleus.
orbit
attach
repel
attract
3
The nucleus is made of of what particles?
neutrons and protons
protons and electrons
atoms and electrons
electrons and neutrons
4
Which of the following elements is a non metal?
argon
tungsten
sodium
titanium
5
The number of protons and electrons are equal in which type of atom?
polar
charged
ion
neutral
6
The number of protons is also the _________ number.
neutron
nuclear
control
atomic
7
An element has isotopes with percent abundances 34.83 and 9.55, what is the third percentage?
44.8
-55.2
55.62
59.9
8
Which of the following elements has the largest atomic mass? Cr, Mn, K, Ni
Cr
Ni
Mn
K
9
The isotope Oxygen-18 has how many neutrons?
10
7
8
9
10
Which of the following elements has the smallest atomic mass? Ta, Ba, Pb, Zr
Zr
Pb
Ta
Ba
11
What is the symbol for Cadmium?
Ca
Cr
Cm
Cd
12
How many electrons are in the following atom? Na
1+
9
10
11
14
13
Atoms with the same number of protons but different number of neutrons are called what?
ions
elements
bonds
isotopes
14
How many neutrons are in the following isotope? Arsenic-75
33
75
44
42
15
How many electrons are in the following atom? Se
2-
32
36
34
30
16
Who is responsible for the discovery of the electron?
Rutherford
Bohr
Thomson
Watson
17
What is the charge of an atom with 55 protons and 52 electrons?
3-
2+
3+
0
18
_______ theory was the first original theory of an atom.
Rutherford
Dalton
Watt
Thomson
19
What is the correct unit for atomic mass?
amu
cm3
grams
liters
20
A neutral atom of Bromine has how many electrons?
34
36
35
17
