MSE 201 EXAM 1 QUESTIONS AND CORRECT
ANSWERS 100% VERIFIED
weight of electron - ANSWER 9.11x10-31
weight of proton and neutron - ANSWER 1.67x10-27
atomic number - ANSWER number of protons in nucleus of atom or the number of
electrons in a neutral species
amu - ANSWER 1/12 mass of C12
atomic weight - ANSWER average weighted mass of all isotopes of an element
electrons have _________ and _______ properties - ANSWER wavelike and particulate
electrons are in _____________ defined by ______________ - ANSWER orbitals, probability
each orbital at discrete energy level is determined by ___________ - ANSWER quantum
number
Quantum number: n. Called? Determines? - ANSWER principle, size
Quantum number: l. Called? Determines? - ANSWER subsidiary, shape
Quantum number: ml. Called? Determines? - ANSWER magnetic, # of orbitals in each
sub shell
,Quantum number: ms. Called? Determines? - ANSWER direction of spin
Bohr Model - ANSWER electrons revolve around nucleus in discrete orbitals. electrons
have quantized energy levels.
Wave Mechanical Model - ANSWER electrons are viewed as probability distribution,
more current
Difference between Wave Mechanical Model and Bohr Model? - ANSWER
Wave-electrons are viewed as probability distribution
Bohr-electrons revolve around nucleus in discrete orbitals.
Pauli Exclusion Principle - ANSWER Each electron state can hold no more than two
electrons (each opposite spin)
Electrons have ____________ energy states - ANSWER discrete
Electrons tend to occupy the ____________ energy state - ANSWER lowest available
electrons can change energy states by: - ANSWER 1. absorption, 2. emission
energy ______________ with relative distance from the nucleus - ANSWER increases
most elements do/do not have stable electron configuration? - ANSWER do not
"stable" electrons - ANSWER electrons in a state where the outermost shell are
completely full
valence electrons - ANSWER electrons in unfilled shells, participate in bonding b/w
, atoms, tend to control chemical properties
what controls chemical properties? - ANSWER valence electrons
similar valence structures means similar ___________ - ANSWER chemical and physical
properties
which side of the periodic table is NM and what do they do? - ANSWER right, accepts
electrons
which side of the periodic table is M and what do they do? ANSWER left, donates
electrons
what is the periodic trend of electronegativity? and why? -ANSWER LEFT TO RIGHT,
because of the pull between the positive nucleus and the negative electrons, the more
positive nucleus, the stronger the pull to the negative electrons, BOTTOM TO TOP,
because of the decrease in shielding effect making it easier to attract more electrons
Electronegativity is ____________ -ANSWER the ability an atom has to attract other
electrons
Atoms having high electronegativities will: - ANSWER be attracted to more electrons
and may even steal from other atoms.
Atoms having low electronegativities will: - ANSWER share the most, sometimes to the
point of losing their own electrons
Ionic bond: - ANSWER -made up of M and NM
-non directional
-occurs between + and - ions
-requires electron transfer
ANSWERS 100% VERIFIED
weight of electron - ANSWER 9.11x10-31
weight of proton and neutron - ANSWER 1.67x10-27
atomic number - ANSWER number of protons in nucleus of atom or the number of
electrons in a neutral species
amu - ANSWER 1/12 mass of C12
atomic weight - ANSWER average weighted mass of all isotopes of an element
electrons have _________ and _______ properties - ANSWER wavelike and particulate
electrons are in _____________ defined by ______________ - ANSWER orbitals, probability
each orbital at discrete energy level is determined by ___________ - ANSWER quantum
number
Quantum number: n. Called? Determines? - ANSWER principle, size
Quantum number: l. Called? Determines? - ANSWER subsidiary, shape
Quantum number: ml. Called? Determines? - ANSWER magnetic, # of orbitals in each
sub shell
,Quantum number: ms. Called? Determines? - ANSWER direction of spin
Bohr Model - ANSWER electrons revolve around nucleus in discrete orbitals. electrons
have quantized energy levels.
Wave Mechanical Model - ANSWER electrons are viewed as probability distribution,
more current
Difference between Wave Mechanical Model and Bohr Model? - ANSWER
Wave-electrons are viewed as probability distribution
Bohr-electrons revolve around nucleus in discrete orbitals.
Pauli Exclusion Principle - ANSWER Each electron state can hold no more than two
electrons (each opposite spin)
Electrons have ____________ energy states - ANSWER discrete
Electrons tend to occupy the ____________ energy state - ANSWER lowest available
electrons can change energy states by: - ANSWER 1. absorption, 2. emission
energy ______________ with relative distance from the nucleus - ANSWER increases
most elements do/do not have stable electron configuration? - ANSWER do not
"stable" electrons - ANSWER electrons in a state where the outermost shell are
completely full
valence electrons - ANSWER electrons in unfilled shells, participate in bonding b/w
, atoms, tend to control chemical properties
what controls chemical properties? - ANSWER valence electrons
similar valence structures means similar ___________ - ANSWER chemical and physical
properties
which side of the periodic table is NM and what do they do? - ANSWER right, accepts
electrons
which side of the periodic table is M and what do they do? ANSWER left, donates
electrons
what is the periodic trend of electronegativity? and why? -ANSWER LEFT TO RIGHT,
because of the pull between the positive nucleus and the negative electrons, the more
positive nucleus, the stronger the pull to the negative electrons, BOTTOM TO TOP,
because of the decrease in shielding effect making it easier to attract more electrons
Electronegativity is ____________ -ANSWER the ability an atom has to attract other
electrons
Atoms having high electronegativities will: - ANSWER be attracted to more electrons
and may even steal from other atoms.
Atoms having low electronegativities will: - ANSWER share the most, sometimes to the
point of losing their own electrons
Ionic bond: - ANSWER -made up of M and NM
-non directional
-occurs between + and - ions
-requires electron transfer
