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Sci 8 Ch 6 Atoms and the Atomic Theory Flashcards | StudBud
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Sci 8 Ch 6 Atoms and the Atomic Theory
Sci 8 Ch 6 Atoms and the Atomic Theory
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#Review of History of the Atomic theory and #basics of the atom and its structure
Flashcards
29 cards
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Questions
29
Answers
1
The SI unit used to express the masses of particles in atoms is the
Newton (N)
Kilogram (Kg)
gram (g)
atomic mass unit (AMU)
2
Who suggested that electrons travel around the nucleus in definite paths?
Bohr
Thomson
Rutherford
Dalton
3
Which of the following has the LEAST mass?
neutrons
protons
electrons
4
Thomson's plumb pudding model suggested that
electrons are not located in an atom.
electrons were in the center of the atom.
electrons are positively charged.
electrons were mixed throughout the atom.
5
1. The smallest particle into which an element can be divided and still be the same element is
electron
neutron
proton
atom
6
The word atoms means
divisible
invisible
hard particles
indivisible
7
An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a mass number of
276
79
197
158
8
.Neutrons are particles that
help make up the nucleus and have no charge.
are located outside of the nucleus and have no charge.
help make up the nucleus and are positively charged.
located outside of the nucleus and are negatively charged.
9
Which of the following ideas was part of Dalton’s atomic theory?
atoms CAN be destroyed
Some substances are made of atoms.
All substances are made of atoms.
Atoms can be divided.
10
What particles make up a nucleus?
protons and neutrons
neutrons
electrons and protons
electons and neutrons
11
The Greek philosopher who gave the atom its name was
Democritus
Bohr
Dalton
Thomson
12
The current model of the atom suggests that
proton clouds surround the nucleus.
the exact path of a moving electron can be predicted.
electrons travel in definite paths around the nucleus.
electron clouds surround the nucleus.
13
Who discovered that there are small particles inside the atom?
Dalton
Rutherford
Thomson
Bohr
14
What important idea emerged from the results of Rutherford’s experiment?
Atoms have electrons within the nucleus.
Atoms are mostly empty space with a tiny, massive nucleus.
Atoms are mostly electrons.
Atoms are mostly empty space with no nucleus.
15
An isotope used in nuclear reactors, uranium-235, has 92 p+, how many e- do its isotopes have?
143
95
92
235
16
The force that pulls objects toward one another.
strong
weak
electromagnetic
gravitational
17
How can you distinguish between isotopes?
look at the mass number
Look at the atomic number
look at the number of protons
all of the above
18
an important force in radioactive atoms
electromagnetic
weak
gravitational
strong
19
How can you tell that these two atom models represent isotopes of the same element.
they aren't isotopes
the number of neutrons is constant
the number of p+ is different
the number of p+ is the same
20
Lithium atom has 3 p+, 3 n, & 3 e-. Which of the particles represents an isotope of this atom?
3 protons, 4 neutrons, and 3 electrons
3 protons, 3 neutrons, and 2 electrons
3 protons, 3 neutrons, and 2 electrons
4 protons, 3 neutrons, and 4 electrons
21
If a boron atom has 5 protons, 6 neutrons, and 5 electrons, it has an atomic number of
11
6
5
4
22
Which of the following determines the identity of an element?
atomic number
overall charge
number of neutrons
mass number
23
Isotopes exist because atoms of the same element can have different numbers of
protons
neutrons
electrons
none of the above
24
If carbon has an atomic number of 6, how many neutrons does carbon-12 have?
8
6
12
18
25
Which scientist performed an experiment proving the existence of an atomic nucleus?
Democritus
Thomson
Dalton
Rutherford
26
If an atom of an element has an atomic number of 6, the number of protons ...
= 6 AND is the same as the number of electrons.
= 6
is the same as the number of electrons
doesn't matter
27
The atomic number of an atom is the total number of ____ in the nucleus.
protons
electrons
protons and electrons
protons and neutrons
28
Electrons are particles that
help make up the nucleus and are positively charged.
located outside of the nucleus and have no charge.
help make up the nucleus and are negatively charged.
located outside of the nucleus and are negatively charged.
29
The type of force that helps protons stay together in the nucleus
electromagnetic
weak
gravitational
strong
