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WorksheetsUnit 2 Test: Atomic Theory and Structure
Total questions: 22
Worksheet time: 32mins
The nucleus of an atom is
Negatively charged and has a low density.
Negatively charged and has a high density.
Positively charged and has a low density.
Positively charged and has a high density.
None of these
An atom of an element with atomic number 48 and mass number 120 contains
48 protons, 48 electrons, and 72 neutrons
72 protons, 48 electrons, and 48 neutrons
120 protons, 48 electrons, and 72 neutrons
72 protons, 72 electrons, and 48 neutrons
Which of these statements is not true?
Atoms of the same element can have different masses
The nucleus of an atom has a positive charge
Atoms of isotopes of an element have different numbers of protons
Atoms are mostly empty space
What is the Element Symbol, Number of protons, Number of neutrons, and Charge on Atom
If the Atomic Number: 51, Mass Number: 122, # of electrons: 54
Element Symbol: Sb,
# of protons: 51,
# of neutrons: 71,
charge on atom: -3
Element Symbol: Lu,
# of protons: 51,
# of neutrons: 71,
charge on atom: -3
Element Symbol: Sb,
# of protons: 52,
# of neutrons: 68,
charge on atom: +3
Element Symbol: Xe
# of protons: 54,
# of neutrons: 68,
charge on atom: 0
How many neutrons are there in Pb-206? Pb-207?
Pb-206: 124, Pb-207: 125
Pb-206: 122, Pb-207: 123
Pb-206: 126, Pb-207: 127
Pb-206: 128, Pb-207: 129
How can you determine the number of neutrons in an atom if you know its atomic number and mass number?
Subtract the atomic number from the mass number
Add the atomic number to the mass number
Multiply the atomic number by the mass number
Divide the mass number by the atomic number
What is the charge of a proton?
Negative
Positive
Neutral
Variable
Which of the following is true about isotopes?
They have different atomic numbers but the same mass number
They have the same atomic number but different mass numbers
They have different numbers of electrons but the same number of protons
They are always ions
Which subatomic particle is not found in the nucleus of an atom?
Proton
Neutron
Electron
All of the above are found in the nucleus
This science discovered the electrons was a small negativity charged particle. He wrongly believed that the electron was found inside a hard dense sphere.
(a)
Thompson preformed the Cathode Ray Tube experiment. When he preformed this experiment the beam in the tube bent away from the negative side of the magnetic determining the charge of the beam was
(a)
Rutherford discovered that the atom was mostly what?
(a)
Rutherford also determined that there was a small dense (a) charge center of the atom that caused alpha particles to be deflected when they came in contact with it.
John Dalton had four points to his Atomic Theory. Describe the four points.
John Dalton's Atomic Theory was considered very sound at the time of it's creation. Overtime different parts of it were disproven. Describe two ways that theory was incorrect about atoms.
"Everything is composed of atoms" was first stated by:
How many electrons are in the oxygen-17 atom that has an overall charge of -2.
(a)
What is the atomic mass of an atom with the atomic number=26, neutrons=28, and electrons=23
(a)
What is the isotopic name for the element that has 9 protons, 9 neutrons, and 9 electrons
(a)
What is the average atomic mass of element X if there are three known isotopes of elements X.
X-183, X-184, and X-187 they have the abundances of 85.76%, 12.74%, and 1.50% respectively (meaning they go in the same order). Type your answer too two decimals.
(a)
What isotope will the average atomic mass of element Y be closest too?
Y-17, Y-18, and Y-19 they have the abundances of 9.76%, 90.01%, and 0.23% respectively (meaning they go in the same order).
(a)
What is the average atomic mass of element Z if there are two major isotopes:
Z-274 (72.28 %) and Z-278 (27.72%)
274.18 amu
275.11 amu
277.98 amu
276.88
