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Atomic Structure Review Flashcards | StudBud
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Atomic Structure Review
Atomic Structure Review
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Ch 4!
Flashcards
28 cards
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Practice quiz
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Questions
28
Answers
1
Which of the following equals one atomic mass unit?
the mass of one carbon-12 atom
the mass of one helium-4 atom
one-twelfth the mass of one carbon-12 atom
the mass of one electron
2
Atoms are
very large
solid spheres
indivisible
very small
3
How many protons, neutrons, and electrons are in the atom in the picture?
35 protons 35 electrons, 35 neutrons
35 protons, 46 electrons, 35 neutrons
35 protons, 35 electrons, 81 neutrons
35 protons, 35 electrons, 46 neutrons
4
The atomic number of an element is the total number of which particles in the nucleus?
neutrons
protons
electrons
protons and electrons
5
How do the isotopes hydrogen-1 and hydrogen-2 differ?
Hydrogen-2 has one neutron; hydrogen-1 has none.
Hydrogen-2 has one more electron than hydrogen-1.
Hydrogen-2 has one proton; hydrogen-1 has none.
Hydrogen-2 has two protons; hydrogen-1 has one.
6
Isotopes of the same element have different
numbers of neutrons.
atomic numbers.
numbers of protons.
numbers of electrons.
7
Which of the following statements is true?
Electrons are negatively charged and have a mass of 1 amu.
The nucleus is negatively charged
Neutrons are negatively charged and have a mass of 1 amu.
Protons are positively charged and have a mass of 1 amu.
8
Which element has 12 protons, 12 electrons, and 13 neutrons?
Aluminum-24
Magnesium-25
Magnesium-12
Aluminum-13
9
What did Rutherford discover with the gold foil experiment?
The atom is very dense
The electron
Protons
The atomic nucleus
10
Which of the following is correct concerning subatomic particles?
Cathode rays were found to be made of protons.
The proton was discovered by Thomson.
The nucleus was discovered with the gold foil experiment
The electron was discovered by Rutherford
11
Using the periodic table, determine the number of electrons in O.
16
24
8
4
12
Isotopes of the same element have different
chemical behavior.
mass numbers.
positions on the periodic table.
atomic numbers.
13
What unit is used to measure weighted average atomic mass?
Angstrom
Gram
AMU
Mass Number
14
How is the number of neutrons in the nucleus of an atom calculated?
Subtract the number of protons from the mass number.
Add the mass number to the number of electrons.
Subtract the number of electrons from the number of protons.
Add the number of electrons and protons together.
15
What does the number 84 in the name krypton-84 represent?
the sum of the protons and electrons
twice the number of protons
the mass number
the atomic number
16
What is the charge of a proton? Pick the best answer!!!
Positive 1
Negative 1
Positive
Negative
17
What is the relative mass of an electron?
1/1840 the mass of a neutron or proton
the same as the mass of a proton or neutron
1 amu
1/1840 the mass of a C-12 atom
18
Which of the following is true about subatomic particles?
The mass of a neutron nearly equals the mass of a proton.
Protons are positively charged and the lightest
Electrons are negatively charged and are the heaviest
Neutrons have no charge and are the lightest
19
What is the charge of a neutron?
Negative
Positive
Neutral
Positive 1
20
Who lived from 460 B.C.–370 B.C. and was among the first to suggest the idea of atoms?
Thomson
Democritus
Atomos
Dalton
21
Which discovery did J. J. Thomson make that improved upon Dalton's atomic theory?
Atoms contain a tiny, positively charged nucleus.
Atoms are always in motion.
Atoms that combine do so in simple whole-number ratios.
Atoms contain tiny, negatively charged electrons.
22
Which of the following was originally a part of Dalton's atomic theory, but had to be changed
Atoms of any one element are different from other elements
Atoms are tiny indivisible particles.
Compounds are made by combining atoms.
Atoms can combine with one another in whole number ratios.
23
All atoms are
neg charged, with the # of electrons exceeding protons
+ charged, with the # of protons exceeding electrons
neutral, with the number of protons = electrons = neutrons
neutral, with the number of protons equaling to electrons
24
The average atomic mass of an element depends upon the
mass of each isotope of that element.
relative abundance of protons in that element.
mass and relative abundance of each isotope of that element.
mass of each electron in that element.
25
Who discovered the electron and with what experiment?
Thomson- The cathode ray tube
Rutherford- The cathode ray tube
Dalton-The gold foil experiment
Thomson- The gold foil experiment
26
The nucleus of an atom is
the central core and is composed of protons and neutrons.
negatively charged and has a high density.
negatively charged and has a low density.
positively charged and always has more protons than neutrons
27
What is the charge of an electron? Pick the best answer!!!
Negative 1
Positive 1
Negative
Positive
28
an atom with atomic number 50 and mass number 125 contains
50 protons, 50 electrons, 75 neutrons
75 electrons, 50 protons, 50 neutrons
120 neutrons, 50 protons, 75 electrons
70 neutrons, 75 protons, 50 electrons
