Atomic Theory Review
TEST FRIDAY, SEPT. 25TH
Subatomic Particles
Q: Which subatomic
particle has a negative
charge?
A: electron
Subatomic Particles
Q: Which subatomic
particle has a positive
charge?
A: proton
Subatomic Particles
Q: Which subatomic
particle is neutral?
A: neutron
Atoms
Q: Atoms are electrically
neutral because the
number of _________
equals the number of
___________.
A: protons equal electrons
Atoms
Q: What is the charge of
the nucleus of an atom?
A: positive (because the
protons are positive)
Atoms
Q: How do you find the
number of protons for an
atom?
A: same as the atomic
number
Atoms
Q: How do you find the
number of neutrons for
an atom?
A: mass # - atomic #
Atoms
Q: How do you find the
number of electrons for
an atom?
A: same as the atomic
number
Atoms
Q: All atoms of the same
element have the same
________ ________.
A: atomic number
Atoms
Q: The atomic mass listed
on the periodic table is a
_______ atomic mass.
A: average
Atoms
Q: Chlorine has atomic
number 17. If a chlorine
atom has a mass of 35,
how many protons does it
have?
A:17 (same as atomic
number)
Atoms
Q: Chlorine has atomic
number 17. If a chlorine
atom has a mass of 35,
how many neutrons does it
have?
A: 18 (subtract mass#atomic#)
Atoms
Q: Chlorine has atomic
number 17. If a chlorine
atom has a mass of 35,
how many electrons does
it have?
A: 17 (same as atomic
number)
Atoms
Q: An aluminum atom has
13 protons, 13 electrons
and 14 neutrons. What is
it’s mass number?
A: 27 (protons + neutrons)
Atoms
Q: An aluminum atom has
13 protons, 13 electrons
and 14 neutrons. What is
it’s atomic number?
A: 13 (same as protons)
Atoms
Q: Carbon - 14 has an
atomic number of 6.
How many neutrons
does it have?
A: 8 (mass # - atomic #)
Atoms
Q: Carbon - 14 has an
atomic number of 6.
How many protons does
it have?
A: 6 (atomic #)
Atoms
Q: Carbon - 14 has an
atomic number of 6.
How many electrons
does it have?
A: 6 (atomic #)
Atoms
Q: How many protons are
in Lithium – 7?
A: 3 (atomic #)
Atoms
Q: How many neutrons
are in Lithium – 7?
A: 4 (mass # - atomic #)
Atoms
Q: How many electrons
are in Lithium – 7?
A: 3 (atomic #)
Atoms
Q: What is the atomic
number for Lithium – 7?
A: 3
Atoms
Q: What is the mass
number for Lithium – 7?
A: 7
Isotopes
Q: Is an atom with 5
protons and 5 neutrons
an isotope of an atom
with 5 protons and 6
neutrons?
A: Yes
Isotopes
Q: Is an atom with 17
protons and 35 neutrons
an isotope of an atom
with 18 protons and 35
neutrons?
A: No
Isotopes
Q: The atomic ______ is
written as a decimal
because it is a weighted
average of all of an
element’s isotopes.
A: mass