Chem. 1 Exam Chapter 3
Which group is Lithium in?
Alkalki Metals
Which of the following statements from Daltons theory was shown to be incorrect?
All matter is made up of very tiny indivisible particles called atoms
Which of the following is likely to form an ion with the largest positive charge?
Aluminum
The fundamental particle of a chemical element according to Dalton's theory is the:
Atom
The identity of an element is determined by its:
Atomic Number
Which of the following is NOT part of Dalton's atomic theory?
Atoms are in constant motion
"Planetary" Model of the atom:
Bohr
"Billiard ball" Model of the atom:
Dalton
Which of the following did Dalton discuss in his atomic theory?
Dalton didn't discuss isotopes, ions, protons, electrons, or nuetrons
Greek philosopher who thought matter could not be divided indefinately:
Democritus
Mendeleev is credited for the modern atomic theory:
False
What is the name of the lowest possible energy state for an electron?
Ground state
Which of the following is true of a 1 gram sample iron?
It contains a very, very huge number of atoms
Which of the following is true of the number of sub-levels associated with a particular level?
It depends on the particular level being considered
Which of the following is true about an anion?
It has fewer protons than electrons
Which of the following is true about a cation?
It has more protons than electrons
Which of the following correctly describes a proton?
It is massive, and has a positive charge
Which is most likely true for an atom with six valence electrons?
It will gain two electrons
Which is most likely true for an atom with one valence electron?
It will lose one electron.
The first scientist to show that atoms emit tiny negative particles was:
J.J. Thomson
Which of the following elements can be found as individual atoms?
Krypton
Devised a set of 4 quantum numbers that describes each electron in an atom:
Planck
Which of the following does not occur naturally as a diatomic molecule?
Sulfur
Which of the following is likely to form an ion with the most negative charge?
Sulfur
The number of valence electrons of a main group element is related to which of the following?
The elements atomic number
The atomic number of an atom is equal to which of the following?
The number of protons in the atom
The mass number of an atom equals:
The number of protons plus the number of protons plus the number of neutrons per atom
Which of the following is true about elements in the same horizontal row of the periodic table?
The number of valence electrons increases as we move left to right across.
Which of the following is the most characteristic feature of the electronic configurations of the elements in a vertical column?
The valence electrons are of the same type and number.
Which is true of isotopes of an element?
They have different numbers of neutrons
"Plum pudding" Model of the atom:
Thompson
When filling a set of orbitals of equal energy which of the following is true?
Two electrons will occupy different orbitals and have different spins
An anion always contains:
Unequal numbers of protons and electrons
How many electrons can be accommodated in the 2d sublevel?
none, there is no 2d sublevel.
Which element is currently used to define the atomic mass unit?
Carbon
"Wave Particle duality of nature"
DeBroglie
Uncertainty Principle:
Heisenburg
An atom:
Is much larger than its nucleus
Which element found in the human body is not diatomic?
Not hydrogen, oxygen, and nitrogen.
Which subatomic particles are found in the nucleus?
Protons and neutrons
Nucleus is postively charged and hold most of the atoms mass:
Rutherford
If isotopic abundance does vary with location what is the significance of that observation?
Samples of the element obtained from different locations may not result in the same value.
Devised an equation that quantized the energy of the electron and defined the probability of finding an electron in a given place:
Schrodinger
Which of the following is least likely to form an ion?
Silicon
The mass number is equal to?
The total number of protons and neutrons in the atom
The average mass of a boron atom is 10.81. Assuming you were able to isolate only one boron atom, the chance that you would randomly get one with a mass of 10.81 is:
0%
Which of the following sets of numbers could be used to designate the principal energy levels in an atom?
1,2,3,4,5
How many electrons held in a p orbital?
2
The atom with 68 neutrons and 50 protons has a mass number of:
50
Strontium-90 contains how many neutrons?
52 neutrons
How many electrons can accommodated in the 4p sublevel?
6
The orbitals of which of the following sublevels have the most complicated shapes?
f
The law of constant composition applies to:
Compounds
Cobalt-60 contains how many protons?
27 protons
What is the maximum number of unpaired electrons in the Lewis structure?
3
How many electrons can be accommodated in the fourth energy level of an atom?
32
Cobalt-60 contains how many neutrons?
33 neutrons
Strontium-90 contains how many protons?
38 protons
How many valence electrons are there in an oxygen atom?
4
How many neutrons are contained in an iodine nucleus with a mass number of 131?
78
What percentage of the human body's mass do the three most abundant elements comprise?
93.0%
Which of the following is most likely to form a cation?
A metal
The halogen in the the third period:
Chlorine
Which atomic particle determines the chemical behavior of an atom?
Electron
The scientist whose alpha-particle scattering experiment led him to conclude that the nucleus of an atom contains a dense center of positive charge is:
Ernest Rutherford
The second most abundant element in the Earth's crust is a:
Metalloid
Which property of the element is used to name the isotope?
Number of nuetrons
Which is the most abundant element in the human body and in the Earth?
Oxygen
An atom with 15 protons and 16 electrons is an atom of:
P
