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Distinguishing Among Atoms (Chapter 4.3) Flashcards | StudBud
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Distinguishing Among Atoms (Chapter 4.3)
Distinguishing Among Atoms (Chapter 4.3)
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This Quiz summarizes Chapter 4.3 of Prentice Hall Chemistry
Flashcards
20 cards
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Questions
20
Answers
1
Which of the following is NOT a part of Dalton's atomic theory?
Atoms are always in motion.
All elements are composed of atoms.
Atoms that combine do so in simple whole-number ratios.
Atoms of the same element are identical.
2
Isotopes of an element have different numbers of neutrons and therefore different mass numbers.
False
True
3
Since atoms are electrically neutral, the # of electrons equals the # of
protons
neutrons
atoms
gammatrons
4
The number of protons in the nucleus of an atom is the _______.
atomic number of that element
isotope of that element
atomic mass of that element
mass number of that element
5
Mass number - atomic number = ________________.
number of electrons
number of atoms
number of protons
number of neutrons
6
How are the ATOMIC NUMBER and the NUMBER OF PROTONS related to each other?
they are the same
atomic number is always greater
atomic number is always less
7
To calculate atomic mass of an element, multiply mass of each isotope by its natural abundance
and then multiply the products
and then add the products
and then subtract the products
and then divide the products
8
Dalton's atomic theory included which idea?
Atoms of different elements always combine in 1 to 1 ratios.
All atoms of all elements are the same size.
Individual atoms can be seen with a microscope.
Atoms of the same element are always identical.
9
Which of the following is true about subatomic particles?
Proton - positive charge & the lightest subatomic particle.
Neutron - no charge and is the lightest subatomic particle.
Electron - negative charge & the heaviest subatomic particle
The mass of a neutron nearly equals the mass of a proton.
10
These particles make up the nucleus:
protons + neutrons
protons, neutrons + electrons
protons + electrons
11
The atomic number of carbon (C) is
4
12.0107
6
9.012
12
Elements are different because they contain different numbers of
neutrons
electrons
isotopes
protons
13
A weighted average mass of the atoms in a naturally occurring sample of an element is its ____.
atomic symbol
mass number
atomic number
atomic mass
14
How many neutrons does Neon-22 have?
12
11
9
10
15
What is the
atomic mass
of sulfur (S)?
48
48.06
16
32.06
16
Most of the mass of an atom is concentrated in its _________.
isotope
electron cloud
group
nucleus
17
The number of neutrons in an atom is the difference between the mass number and ______.
the energy number
the atomic number
the molecular number
the atomic mass
18
Isotopes
are atoms that have the same number of protons but different numbers of ______.
protons
neutrons
electrons
atoms
19
Who discovered the neutron?
Dalton
Chadwick
Thomson
Millikan
20
Atoms are composed of ________.
electrons
protons
all of these
neutrons
