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Atomic Structure
Atomic Structure
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1
The subatomic particle that identifies the element
neutron
electron
nucleus
proton
2
Electrons have a mass of
1 amu
3 amu
2 amu
0 amu
3
The number of energy levels that are filled is determined by its
neutrons
photons
protons
electrons
4
Atoms of the same element having diff mass numbers due to different numbers of neutrons are
isotherms
isobars
ions
isotopes
5
Protons have a mass of
0 amu
2 amu
3 amu
1 amu
6
According to the modern atomic theory, it is nearly impossible to determine an electron's exact
charge
mass
location
color
7
What is an ion?
charged atom
no of these
same as isotope
neutral atom
8
How many neutrons?
35
0
17
18
9
Oxygen's atomic number is 8. This means an oxygen atom has
a total of 8 protons and neutrons
has 8 neutrons in its nucleus
8 protons in its nucleus
a total of 8 neutrons and electrons
10
Subatomic particle that has a positive charge
electron
nucleus
neutron
proton
11
In standard notation, the top number is the element's
mass number
number of protons
atomic number
atomic mass
12
Which statement about an atom's nucleus is correct?
it is made of electrons and has a negative charge
It is made of electrons and has a positive charge
It is made of protons and neutrons and has a positive charge
It is made of protonsand neutrons and has no charge
13
An atom's mass number equals its
neutrons
protons plus the number of neutrons
protons plus the number of electrons
protons
14
How many electrons does Potassium have?
39
21
40
19
15
The subatomic particle that has a negative charge is called a(n)
compound
molecule
element
electron
16
An element's atomic number is equal to its number of
protons and neutrons
valence electrons
neutrons
protons
17
Two different isotopes of an element have different
atomic numbers
numbers of neutrons
numbers of electrons
numbers of protons
18
Dalton's atomic theory was accepted because
Democritus said it was correct.
there was evidence to support it.
Dalton invented the electron microscope.
Dalton showed how many molecules formed
19
How many protons does Boron have?
5
11
6
10
20
Thomson is responsible for discovering that an atom contains
a nucleus
electrons
anodes
molecules
21
Atoms have no electric charge because they
have neutrons in their nuclei.
have an equal number of neutrons and protons.
have an equal number of charged and noncharged particles
have an equal number of electrons and protons.
22
Whose model determined that an atom's positive charge is concentrated in the atom's center?
Dalton
Bohr
Thomson
Rutherford
23
Valence electron's determine an atom's
mass.
reactivity.
period number.
electric charge.
24
Electrons found in the outermost energy level
don't exist
are stable
electron cloud
valence
25
This is an example of whose model?
Thomson
Bohr
Rutherford
Dalton
26
How much effect do commonly found isotopes have on the average atomic mass of an element?
same as rarely found ones
more than rarely found one
no effect on atomic mass
less than rarely found ones
27
How many valence electrons does this element have?
8
4
6
2
28
Neutrons are
negative
have no charge
positive
smaller than electrons
29
What element is this?
Boron
Hydrogen
Helium
Lithium
30
Aluminum has a mass of 27 and atomic number of 13. How many neutrons?
13
14
12
27
