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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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1
True or false: opposites attract
true
false
2
What is the charge on an electron?
positive 1
it depends on how much energy it has
no charge
negative 1
3
True or false: isotopes of the same element have the same number of protons.
true
false
4
True or false: isotopes of the same element have the same number of electrons when neutral.
true
false
5
What is the mass of a singular calcium atom that contains 20 neutrons?
20 amu
40.08 amu
40 amu
22 amu
6
Why did James Chadwick propose the existence of neutrons?
He noticed that only some objects are charged
He didn't agree with JJ Thomson's model
He saw the evidence from Rutherford's experiment
He noticed the masses of nuclei didn't add up as expected
7
True false: Dalton believed that atoms were indivisible
true
false
8
What is the mass of an electron?
2 amu
1 amu
no mass
1/1840 amu
9
The most common isotope of chlorine is most likely:
Chlorine-17
Clorine-36
Chlorine-35
Chlorine-18
10
The law of conservation of matter states that:
Matter is anything that has mass and volume
In a chemical process, matter can be destroyed and created
All atoms are indestructible
The amount of matter in the universe is fixed
11
How many protons are in a neutral fluorine atom?
10
8
9
19
12
If a carbon atom has a mass of 14 amu, how many protons and neutrons does it have?
8 protons and 6 neutrons
8 protons and 8 neutrons
6 protons and 8 neutrons
6 protons and 6 neutrons
13
Where are neutrons located?
outside the nucleus
in the nucleus
14
Pick the statement that best describes the Rutherford model of the atom.
Plum Pudding Model
Dense, positive nucleus surrounded by negative charges
Atoms as small, uniform spheres with hooks
Small negative charges surrounded by a positively charged substance
15
How do two positively charged objects interact with each other?
Slight repulsion
Slight attraction
Strong repulsion
Strong attraction
16
The number 37 in the name chlorine-37 represents
the mass number
the number of electrons
the atomic mass
the number of protons
17
What does it mean for an objective to carry a positive charge?
It is made of electrons
It has more electrons than protons
It has no neutrons
It has more protons than electrons
18
Element X has isotopes with masses of 24 and 25. If X's average mass is 24.3, which is true?
There must be a higher abundance of X-25 than X-24
X-26 must also exist
X-23 must also exist
There must be a higher abundance of X-24 than X-25
19
Element-54 is ~3x more abundant than Element-56. Which is closest to the average atomic mass?
56.895 amu
56.0 amu
54.003 amu
54.65 amu
20
What is the mass of a neutron?
1 amu
2 amu
significantly less than 1 amu
no mass
21
What is the charge on a proton?
positive 1
it depends on how much energy it has
no charge
negative 1
22
What is the mass of a proton?
2 amu
significantly less than 1 amu
1 amu
no mass
23
Where are protons located?
in the nucleus
outside the nucleus
24
Which of the following best summarizes JJ Thomson's Plum Pudding Model?
Electrons organized by energy level
Small negative charges surrounded by a positively charged substance
Dense, positive nucleus surrounded by negative charges
Electrons orbit the nucleus like planets around the sun
25
How many electrons are in a neutral chlorine atom?
36
35
18
17
26
True or false: Dalton's theory of the atom described atoms as having charges
true
false
27
True or false: Dalton described chemical reactions as the combining and separating of atoms
true
false
28
What experiment is depicted in this image?
Gold Foil Experiment
Cathode ray tube experiments
Ernest Rutherford
Law of Conservation of Mass
29
True or false: all isotopes of the same element have the same atomic mass.
true
false
30
How many neutrons does carbon's most common isotope contain?
6
8
14
12
31
In Rutherford's gold foil experiment, which of the following occurred?
Most of the alpha particles bounced back
Most alpha particles went straight through the foil
Most of the alpha particle were deflected slightly
Some of the alpha particles hit Rutherford in the face
32
True or false: isotopes of the same element have the same chemical properties.
true
false
33
What element is depicted in this picture of a neutral atom? (blue=electron, red=proton, yellow=neutron)
Helium
Carbon
Beryllium
Boron
34
What is the mass of a singular hydrogen atom that contains no neutrons?
all hydrogen atoms contain neutrons
1 amu
0 amu
2 amu
35
What is the charge on a neutron?
negative 1
positive 1
it depends on how much energy it has
no charge
36
What did JJ Thomson base his theory of electrons on?
Gold Foil Experiment
Law of Conservation of Mass
Cathode ray tube experiments
Ernest Rutherford
37
How many neutrons does helium-4 contain?
1
0
4
2
38
Who first proposed the concept of an atom?
John Dalton
Ernest Rutherford
Democritus and/or Leucippus
Antione Lavoisier
39
True or false: isotopes of the same element have the same number of neutrons.
false
true
40
Where are electrons located?
outside the nucleus
in the nucleus
