atomic concepts

	atomic concepts.....

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cross-word puzzle

skills students should be able to do

real-world connections

skills students should be able to do

relate experimental evidence (given in aim 1) to models of the atom
use models to describe the structure of an atom
calculate the mass of an atom, the number of neutrons or the number of protons, given the other two values
determine the number of protons or electrons in an atom or ion when given one of these values
draw a Lewis electron-dot structure of an atom
distinguish between valence and non-valence electrons, given an electron configuration, e.g., 2-8-2
given an atomic mass, determine the most abundant isotope
calculate the atomic mass of an element, given the masses and ratios of naturally occurring isotopes
distinguish between ground state and excited state electron configurations, e.g., 2-8-2 vs. 2- 7-3
identify an element by comparing its bright-line spectrum to given spectra

real-world connections

flame tests
neon lights
fireworks
forensic analysis
spectral analysis of stars
lasers

fill-in the blanks

Words: atom, average, chemical, electron, emitted, energy, excited, identify, isotopes, mass, modern, neutron, number, opposite, orbitals, positively, subatomic, valence, wave- mechanical

The _______ model of the atom has evolved over a long period of time through the work of many scientists. Each _____ has a nucleus, with an overall positive charge, surrounded by one or more negatively charged electrons. __________ particles contained in the nucleus include protons and neutrons. The proton is _________ charged, and the neutron has no charge. The _________ is negatively charged. Protons and electrons have equal but _________ charges. The _________ of protons equals the number of electrons in an atom. The _____ of each proton and each neutron is approximately equal to one atomic mass unit. An electron is much less massive than a proton or a _________. In the _________________ model (electron cloud model), the electrons are in ________, which are defined as the regions of the most probable electron location (ground state). Each electron in an atom has its own distinct amount of _______. When an electron, in an atom, gains a specific amount of energy, the electron is at a higher energy state (_______ state). When an electron returns from a higher energy state to a lower energy state, a specific amount of energy is _______. This emitted energy can be used to _________ an element. The outermost electrons in an atom are called the _________ electrons. In general, the number of valence electrons affects the __________ properties of an element. Atoms of an element that contain the same number of protons but a different number of neutrons are called ________ of that element. The average atomic mass of an element is the weighted _________ of the masses of its naturally occurring isotopes.

quiz 1

Question #1
The modern model of the atom has evolved
[A] over a long period of time through the work of one scientist.
[B] over a long period of time through the work of many scientists.
[C] over a short period of time through the work of one scientist.
[D] over a short period of time through the work of many scientists.

Question #2
What is the charge of any nucleus?
[A] positive
[B] negative
[C] neutral
[D] all of thee above

Question #3
Which answer is different from the others?
[A] Proton
[B] Neutron
[C] Nucleus
[D] Electron

Question #4

The cathode ray tube helped to construct which model of the atom?
[A] Hard Sphere Model
[B] Plum-Pudding Model
[C] Planetary Model
[D] Wave-Mechanical Model

Question #5
What is another name for the gold-foil experiment?
[A] Cathode ray experiment
[B] Alpha-particle experiment
[C] Beta-particle experiment
[D] all of the above

Question #6
Which choice has the model of the atom in correct chronological order?
[A] Plum-Pudding Model; Hard Sphere Model; Planetary Model; Wave-Mechanical Model
[B] Hard Sphere Model; Plum-Pudding Model; Planetary Model; Wave-Mechanical Model
[C] Hard Sphere Model; Plum-Pudding Model; Wave-Mechanical Model; Planetary Model
[D] Hard Sphere Model; Planetary Model; Plum-Pudding Model; Wave-Mechanical Model

Question #7
Where is most of the mass of an atom located?
[A] Around the nucleus
[B] In the nucleus
[C] In the electrons
[D] Over the nucleus

Question #8
The mass of an electron is considered negligible.
True
False

Question #9
Which of the following are in the nucleus of an atom?
[A] electrons and neutrons
[B] protons and neutrons
[C] protons and electrons

Question #10
Alpha particles are negatively charged.
True
False

quiz 2

Question #1
Some atoms have a nucleus with overall neutral charge.
True
False

Question #2
Which of the following statements is incorrect?
[A] A nucleus exists in every atom.
[B] A nucleus contains positive charges only.
[C] A nucleus contains protons and electrons.
[D] The mass of a nucleus is equal to the atomic mass.

Question #3
Neutral atoms become ions when they lose or gain electrons.
True
False

Question #4
How many electrons are in H+?
[A] 0
[B] 1
[C] 2
[D] 3

Question #5
A proton has a mass of 1 amu and a charge of +1.
True
False

Question #6
Which subatomic particle surrounds the nucleus and has 0 amu?
[A] Protons
[B] Neutrons
[C] Electrons

Question #7
How many electrons are present in C-12?
[A] 1
[B] 6
[C] 12
[D] 24

Question #8
An atom of beryllium consists of 4 protons, 5 neutrons, and 4 electrons. The mass number of this atom is
[A] 8
[B] 4
[C] 16
[D] 9

Question #9
When an atom becomes a negative ion, the atom
[A] gains proton.
[B] gains electron.
[C] loses proton.
[D] loses electron.

Question #10
As an atom becomes an ion, its mass number.
[A] decreases
[B] increases
[C] remains the same

quiz 3

Question #1
in the wave-mechanical model (electron cloud model), the electrons are in orbitals.
True
False

Question #2
How many electrons can fit in energy level 2?
[A] 2
[B] 4
[C] 6
[D] 8

Question #3
In the wave-mechanical model, which state is the most probable electron location?
[A] excited state
[B] ground state
[C] mechanical state
[D] electron state

Question #4
What is the electron configuration of an argon in the ground state?
[A] 2-8-7-1
[B] 1-9-7-1
[C] 2-8-8
[D] 2-7-8-1

Question #5
Each electron in an atom has its own distinct amount of energy.
True
False

Question #6
Electrons in the first energy level have the highest potential energy since they are located closest to the nucleus.
True
False

Question #7
What is the possible electron configuration of a neon atom in the excited state?
[A] 2-8
[B] 2-7-1
[C] 2-7-2
[D] 2-6-1

Question #8
When an electron in an atom gains a specific amount of energy, the electron is at a (an)
[A] excited energy state.
[B] ground energy state.
[C] higher energy state.
[D] lower energy state.

Question #9
When an electron move from a lower energy state to a higher energy state, a specific amount of energy is emitted.
True
False

Question #10
Bright line spectra are used to identify elements.
True
False

quiz 4

Question #1
How many valence electrons does an atom of sulfur have?
[A] 3
[B] 6
[C] 7
[D] 9

Question #2
An electron dot (Lewis) structure of an atom of neon will have how many dots?
[A] 2
[B] 4
[C] 6
[D] 8

Question #3
Elements in group number 16 on the periodic table of elements have how many valence electrons?
[A] 1
[B] 3
[C] 6
[D] 8

Question #4
An atom of barium has 4 valence electrons.
True
False

Question #5
Which set of symbols represents atoms with valence electrons in the same energy level?
[A] C, B, O
[B] Ne, Br, Co
[C] B, Ga, In
[D] Al, Ar, Xe

Question #6
In the ground state, how many valence electrons does an atom of Boron have?
[A] 1
[B] 2
[C] 3
[D] 4

Question #7
How many valence electrons are in Mg2+?
[A] 2
[B] 4
[C] 6
[D] 8

Question #8
In which shell are the valence electrons of the elements in period 4 found?
[A] 8
[B] 4
[C] 6
[D] 2

Question #9
An atom of hydrogen has 1 valence electron.
True
False

Question #10
Does the number of valence electrons affect the chemical properties of an element?
True
False

quiz 5

Question #1
Atoms of an element that contain a different number of protons but the same number of neutrons are called isotopes of that element.
True
False

Question #2
The average atomic mass of an element is the weighted average of the masses of its naturally occurring isotopes.
True
False

Question #3
Atoms of the same element that have the same number of protons but different number of neutrons are classified as
[A] isomers.
[B] charged atoms.
[C] isotopes.
[D] charged nuclei.

Question #4
What is the number of protons in the nucleus of an atom of Titanium-51?
[A] 19
[B] 20
[C] 21
[D] 22

Question #5
An atom of boron-10 and an atom of boron-11 differ in
[A] nuclear charge and protons.
[B] mass number and neutrons.
[C] number of electrons and protons.
[D] atomic number and protons.

Question #6
Which of the following isotopes of magnesium is the most abundant in nature?
[A] Magnesium-23
[B] Magnesium-24
[C] Magnesium-25
[D] Magnesium-26

Question #7
Isotopes of an element have to have different
[A] number of electrons.
[B] atomic numbers.
[C] mass numbers.
[D] number of protons.

Question #8
Carbon has 2 isotopes with mass numbers of 12 and 14 and has an average atomic mass of 12.0111. This information indicates that
[A] equal number of each isotope are present.
[B] more isotopes have an atomic mass of 12 than 14.
[C] more isotopes have an atomic mass of 14 than 12.
[D] isotopes have only an atomic mass of 12.

Question #9
The average atomic mass of Ne is 20.179 amu and it is calculated from Ne-20 and Ne-21. Therefore,Ne-20 is the most abundant isotope for neon since 20 amu is the closest value to 20.179.
True
False

Question #10
Copper has two natural isotopes, Cu-63 and Cu-65. Which isotope is the most abundant in nature?
[A] Cu-65
[B] Cu-63
[C] None of them

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