Phys 1415 ch 12
If a neutral element has 8 neutrons and 7 electrons which expression correctly identifies the element?
15N7
Which of the following is a quantum number?
2
The nucleus of an electrically neutral iron atom contains 26 protons. How many electrons does this iron atom have?
26
A nucleus with an atomic number of 44 and a mass number of 100 must have
56 neutrons
If a neutral element has the following chemical symbol how many electrons does it have?18O6
6
An element found in another galaxy exists as two isotopes. If 80% of the atoms have an atomic mass of 80.00 amu and the other 20% have an atomic mass of 82.00 amu what is the approximate atomic mass of the element?
80.4 amu
If a neutral element has the following chemical symbol how many electrons does it have? 235U92
92
If an atom has 43 electrons 56 neutrons and 43 protons what is its approximate atomic mass? What is the name of this element?
99 amu technetium
The following statement describe which subatomic particle best? It is electrically charged
A and b
What is the approximate mass of a carbon atom in atomic mass units (amu)? HOW ABOUT A CARBON DIOXIDE MOLECULE?
A carbon atom as a mass of about 12 amu. Carbon dioxide would then have a mass of 44 amu
The frequencies of light emitted by and atom ten add up to
A higher frequency of light emitted by the same atom.
Which is larger a lithium atom or a fluorine atom?
A lithium atom
Which of the following best describes a conceptual model of an atom?
A model that illustrates the tendency of an atom to undergo radioactive decay and the products it produces
What is the main difference between a conceptual model and a physical model?
A physical model represents the shape and form while a conceptual model describes how a system behaves
How is the term photon related to the term quantum?
A quantum of light is actually one photon
Each spectral line in an atomic spectrum represents
A specific frequency of light emitted by an element.
What does the following element description actually mean?
A uranium atom with 92 protons and 146 neutrons
The atomic number of an element matches the number of
A. Protons in the nucleus of an atom and b. Electrons in a neutral atom
An atom absorbs or emits only particular frequencies of light. White light bends into a glass prism and separates into a rainbow of colors. In which of these two scenarios does the electromagnetic radiation behave as a wave?as a particle?
Absorption of light shows particle behavior while ending of light shows wave behavior
Which of the following statements about electrons is true?
All of the above
Which of the following images could describe and element at the atomic level
All of the images
Which is larger an arsenic atom or a sulfur atom?
An arsenic atom
If an element has 18 protons and 20 neutrons and 18 electrons which expression correctly identifies the element?
Argon-38
Which of the following are incorrect statement about the ataom?
Atoms are manufactured in plants and in humans during pregnancy
You could swallow a capsule of germanium Ge(atomic number 32) without significant ill effects. If a proton were added to each germanium nucleus however you wouldn't want to swallow the capsule because there germanium would
Become arsenic
Which color of light comes from the higher energy transition red or blue?
Blue is a higher frequency and therefore corresponds to a higher energy level transition
Which of these has the greatest energy per photon?
Blue light
Which element would have chemical properties the most similar to chlorine (CI)?
Br
Which elements has chemical properties the most similar to chlorine (Cl atomic number 17)?
Br
The element bromaine Br(atomic number 35) has two major isotopes of similar abundance both around 50 percent. The atomic mass of bromine is reported in he periodic table as 79.904 atomic mass units. Choose the most likely set of mass numbers for these two bromine isotopes.
Br-79,Br-81
Which of the following elements is in the fourth period?
Chromium (CR)
Which of the following diagrams best represents the size of the atomic nucleus relative to the size of the atom?
D
The _____ represent the complete range of frequencies of light energy from radio waves to osmium rays.
Electromagnetic spectrum
When an atom is excited its
Electrons are boosted to higher energy levels
What was Niels Bohr's explanation for the observation of atomic spectra?
Electrons could only move in discrete energy steps within an atom
Which of the following statements describes an isotope?
Element with the same number of protons but a different number of neutrons
In the relationship E~f the symbol f stands for the frequency of emitted light and the E stands for the
Energy of the proton
Which of these doesn't describe a metal at room temperature?
Gas
How is it possible to deduce the identity of an element from its electron configuration?
If the atom is electrically neutral the number of electrons corresponds to the atoms atomic number
Strontium, Sr(number 38) is especially dangerous to humans because it tends to accumulate in calcium dependent bone marrow tissues calcium CA number 20. This fact relates to the organization of the periodic table in that strontium and calcium are both
In group 2 of the periodic table
Which of these photons has the smallest energy?
Infrared
If you remove two protons and two neutrons from a gold atom (Au) what new element us formed (if any)?
Ir
What is the valence shell?
It is the outermost shell of electrons in an atom
Which of the following statements doesn't describe a proton?
It orbits around the nucleus of an atom
A beam of protons and a beam of neutrons of the same energy are both harmful to living tissue. The beam of neutrons however is less harmful why?
Neutrons carry no electric charge and thus have a greater likelihood of passing through the tissue
If all the molecules of a body remained part of the body would the body have any odor?
No because there odor be in molecules traveling to our nose
The oldest known elements in the periodic table are the ones with
Odd looking atomic symbols
How many electrons are there in the third shell of sodium Na atomic number 11?
One
Ow many electrons are in the third she'll of sodium Na atomic number 11?
One
The hydrogen spectrum consists of many spectral lines. How can this simple element have so many lines?
One electron can be boosted to many different energy levels
List the following atoms in order of creasing atomic size: thallium, TI; germanium , Ge; tin, Sn; phosphorus, P.
P<Ge<Sn<Tl
Would you use a physical model or a conceptual model to describe the following: the brain, the mind, the solar system, the beginning of the universe?
Physical conceptual physical conceptual
Which contributes more to an atoms mass electrons or protons? Which contributes more to an atoms size?
Protons contribute more to an atoms mass while electrons contribute more to its size
Which of these is not a metal?
Selenium (atomic no=34)
WHICH OF THE following elements is a transition metal?
Silver(Ag)
Suppose that a certain atom possess only four distinct energy levels. Assuming that all transitions between levels are possible how many spectral lines will the atom exhibit?
Six
About how many elements do you have access to as a consumer of market goods.
Ten
Which chemical family is composed almost entirely of man-made elements?
The actinides
Why aren't the atomic masses given in the periodic table whole numbers?
The atomic masses are average atomic masses
A cat strolls across your backyard an hour later a dog with its nose to the ground follows the trail of the cat. Explain what is going on from a molecular point of view.
The dog is smelling molecules from the cat
Since atoms are mostly empty space why don't objects pass through one another?
The electrons on the atoms repel other electrons on other atoms when they get close
Evidence for the existence of neutrons didn't come until many years after the discoveries of the electron and the proton give a possible explanation.
The neutron lacks an electrical charge
What happens to the properties of elements across any period of the periodic table?
The properties of the elements gradually change across any period of the periodic table
The shell model presented in this book is not very accurate. Why then is it presented?
The shell model is simpler and easy to understand
The mass number of an element is
The sum of the protons and the neutrons
Some older cars vibrate loudly when driving at particular speeds. For example at 65 mph the car may be most quiet but at 60 mph the car rattles uncomfortably. How is this analogous to the quantized energy evils of an electron in an atom?
The vibrating car is analogous to one of the energy levels of the electron which is the point at which the electron experiences resonance
WHat do the electron configurations for all the group 18 noble gases have in common?
Their outermost occupied shell are filled to capacity
Which are older the atoms in the body of an elderly person or the atoms in the body of a baby?
They are the same age which is appreciably older than the solar system
Considering how small atoms are what are the chances that at least one of the atoms exhaled in your first breath will be in your last breathe?
Very probable because of how incredibly small atoms are
In what else can you truthfully say that you are a part of every person around you?
We are continually exchanging our atoms
How does the wave model of electrons orbiting the nucleus account for the fact that the electrons can have only discrete energy values?
When an electron wave is confined it is reinforced at only particular freqencies
How does the wave model of electrons obiting the nucleus account for the fact that the electrons can have only discrete energy values?
When an electron wave is confined it is reinforced only at particular frequencies
How would you describe light generated by heating pure elements if it was observed through a prism or spectroscope?
You would see a series of very sharp lines of emitted light