Which idea of John Dalton is no longerconsidered part of the modern view ofatoms?

Atoms of the same element haveidentical masses.

When a gamma ray is emitted by an element, what happens to the atomic mass & atomic number?

Atomic mass stays the same; atomic number stays the same.

Which best describes the current atomic theory?

Atoms are composed of e- in a cloud around a + nucleus.

Consider the spectrum for the hydrogen atom. In which situation will light be produced?

Electrons release energy as theyreturn to the ground state.

Which occurs if an electron transitions from n = 5 to n = 2 in a hydrogen atom?

Energy is released, visible light is emitted

Which statement regarding red and green visible light is correct?

The frequency of green light ishigher than red light.

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Atomic Structure and Electrons Review (NC Released Final Exam Questions)

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Final Exam Review for Chemistry: Subatomic Particles, Electrons, Light, and Nuclear Chemistry

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Answers

1
What is the nuclear composition of uranium-235?
92 electrons + 143 protons
92 protons + 143 electrons
92 protons + 143 neutrons
143 protons + 92 neutrons
2
Which idea of John Dalton is no longerconsidered part of the modern view ofatoms?
Atoms combine in simple whole # ratios to formcompounds.
Atoms of the same element haveidentical masses.
Atoms are extremely small
Atoms of diff. elements combine to get diff. cmpds.
3
In the figure below, what type of nuclear activity is represented?
fusion
alpha emission
beta emission
fission
4
When a gamma ray is emitted by an element, what happens to the atomic mass & atomic number?
Atomic mass stays the same, and the atomic number changes.
Atomic mass stays the same; atomic number stays the same.
Atomic mass changes, and the atomic number stays the same.
atomic mass changes, and the atomic number changes.
5
What energy level transition indicates light emitted by a H atom's wavelength = 103 nm?
n = 5 to n = 2
n = 2 to n = 1
n = 4 to n = 2
n = 3 to n = 1
6
The 1/2-life of P-32 = 14.30 days. How many mg of 20.00 mg of P-32 remain after 85.80 days?
0.3125 mg
0.6250 mg
0.1563 mg
3.333 mg
7
Which best describes the current atomic theory?
Atoms can easily be split, atwhich time they = radioactive
Atoms are composed of e- in a cloud around a + nucleus.
An atom’s mass is determined bythe mass of its neutrons.
Atoms have e- circlingin def. orbits around a + nucleus
8
Given the electronic configuration of 1s2 2s2 2p4 , how many e- are in the outer level?
6
8
4
2
9
Consider the spectrum for the hydrogen atom. In which situation will light be produced?
Electrons release energy as theymove to an excited state.
Electrons release energy as theyreturn to the ground state.
Electrons absorb energy as theymove to an excited state.
Electrons absorb energy as theyreturn to the ground state.
10
Which of the three types of radiation will penetrate the paper and wood?
alpha and beta only
beta only
gamma only
alpha, beta, gamma
11
Which best describes the relationship between subatomic particles in any neutral atom?
# of p+ = # of e-
# of neutrons = # of electrons
# of p+ = # of n
# of neutrons is greater than # of p+
12
Which electron configuration represents a transition element?
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4
1s2 2s2 2p6 3s2
1s2 2s2 2p3
1s2 2s2 2p6 3s2 3p6 4s2 3d7
13
Which particle will complete this reaction of Co-59 + ______ yields Co-60?
proton
nucleus
neutron
electron
14
Which occurs if an electron transitions from n = 5 to n = 2 in a hydrogen atom?
Energy is absorbed, visible light is not emitted
Energy is released, visible light is not emitted
Energy is released, visible light is emitted
Energy is absorbed, visible light is emitted
15
U-238 yields Th-234 plus ________?
beta particle
alpha particle
proton
gamma particle
16
Which statement regarding red and green visible light is correct?
The wavelength of green light islonger than red light.
The speed of green light is greaterthan that of red light.
The energy of green light is lowerthan that of red light.
The frequency of green light ishigher than red light.

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