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Atomic Theory and structure Flashcards | StudBud
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Atomic Theory and structure
Atomic Theory and structure
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atomic theory
Flashcards
28 cards
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Questions
28
Answers
1
How many electrons are in a neutral sodium atom?
23
11
13
12
2
Neutrons have a ________ charge and are found _________.
neutral, in the empty space around the nucleus
neutral, in the nucleus
negative, in the electron shells
positive, in the nucleus
3
The first person to suggest the idea of atoms was ________.
Dalton
Democritus
an alchemist
Aristotle
4
Isotopes are atoms of the same element that have different numbers of ____.
neutrons
electrons
electron shells
protons
5
Who developed the "planetary" model of the atom?
Chadwick
Dalton
Bohr
Thomson
6
The mass number of an atom can be determined by ___.
subtracting atomic number and protons
subtracting neutrons and protons
adding protons and neutrons
adding protons and electrons
7
Why were some particles deflected in the experiment shown here?
They could not pass through the atoms.
They were repelled by the nucleus.
The electrons caused the particles to bounce back.
Atoms are mostly empty space.
8
Mass number can be calculated by ____.
subtracting atomic number and protons
adding protons and electrons
subtracting atomic number and neutrons
adding protons and neutrons
9
James Chadwick made which of the following contributions to the atomic theory?
discovered electrons
discovered neutrons
discovered that atoms are neutral
discovered protons
10
What subatomic particle(s) are located in the nucleus?
protons and electrons
protons only
protons and neutrons
electrons and neutrons
11
Which of the following isotopes represents an atom that has 17 protons and 20 neutrons?
17Cl
35Cl
37Ca
37Cl
12
What is the atomic number of
207
Pb?
207
84
125
82
13
Whose model of the atom is shown below?
Bohr's
Rutherford's
Dalton's
Thomson's
14
How did Bohr modify Rutherford's model of the atom?
added neutrons to the nucleus
proposed the electrons are located in the nucleus
placed electrons in energy levels
discovered the atomic nucleus
15
Whose model of the atom is shown below?
Chadwick's
Dalton's
Rutherford's
Thomson's
16
Which scientist thought atoms were simply solid spheres?
James Chadwick
John Dalton
JJ Thomson
Ernest Rutherford
17
All isotopes of an element have the same ____.
number of neutrons
atomic mass
number of protons
mass number
18
The first atomic theory was proposed by ________.
Chadwick
Thomson
Democritus
Lavoisier
19
Atoms of the same element with different masses are called ____.
isotopes
anions
multiples
ions
20
The Greek word "atomos" means _______.
very small
uncuttable
indestructible
invisible
21
According to Rutherford, where in the atom are electrons located?
distributed evenly all throughout the atom
in circular orbits called electron shells
in the nucleus
in the empty space surrounding the atom
22
The picture below depicts the cathode-ray tube experiment that led to the discovery of _____.
protons
electrons
neutrons
the nucleus
23
Electrons were discovered by _______.
JJ Thomson
James Chadwick
Ernest Rutherford
John Dalton
24
How many neutrons are in a zinc-65 atom?
40
35
65
30
25
Which of the following was accomplished by Ernest Rutherford?
performed experiments with cathode ray tubes
proposed the first atomic theory
discovered that atoms contain large amounts of empty space
developed the plum pudding model of the atom
26
The number of protons in the atom is the ____.
isotope number
atomic number
nuclear force
mass number
27
Who proposed the nuclear model of the atom?
Bohr
Thomson
Rutherford
Dalton
28
Why were some of the alpha particles in Rutherford's experiment able to pass through the foil?
because they were positively charged
they were deflected by the nucleus
because atoms contain a large amount of empty space
because neutrons are neutral
