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Chem 1- History & Structure of the Atom Flashcards | StudBud
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Chem 1- History & Structure of the Atom
Chem 1- History & Structure of the Atom
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History and structure of the atom
Flashcards
21 cards
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Practice quiz
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Questions
21
Answers
1
The average atomic mass of an element..
Is the mass of the most abundant isotope
Is the weighted average of the masses of its isotopes
Is always a whole number
Always add up to 100
2
What was the name of Thomson's model of the atom?
Rice pudding model
Plum pudding model
Electron cloud model
3
What sub atomic particle makes isotopes different from one another?
Neutron
Electron & Neutron
Proton
Electron
4
One isotope of an element has a mass number of 50 and 27 neutrons. What is the element?
Iridium
Arsenic
Vandium
Cobalt
5
What is the charge of a neutron?
Neutral
Positive
Negative
6
The atomic number of an element is equal to the number of
Charge
Neutrons
Protons & Neutrons
Protons
7
The Phlogiston theory was used to describe what happens when substance are...
Burned
Melted
Frozen
Changed
8
The isotope with 12 Protons and 13 Neutrons is..
Mg-25
Mg-13
Mn-12
Mn-25
9
What did Rutherford conclude about the atom as a result of his Gold Foil experiment?
Electrons float in a positively charged substance
The atom is a densely packed substance.
The atom is composed of mostly empty space.
Protons are positively charged
10
What happened in Thomson's cathode ray tube indicating the negative charge of an electron?
The beam was not affected by either positive or negative
The beam was attracted the the negative magnet
The beam was attracted to the positive magnet
The beam was deflected from the positive magnet
11
How do you solve for average atomic mass of an element?
Subtract the mass from the abundance
Divide the abundance by mass
Multiply the abundance by the mass
Add up the isotopic abundances
12
What subatomic particle(s) contribute to the mass of the atom?
Neutrons
Protons
Protons & Electrons
Protons & Neutrons
13
What subatomic particle can be added or taken away to change the charge on an atom?
Electron
Proton
Neutron
14
What is the charge on an electron?
Negative
Neutral
Positive
15
What two particles need to be present in the same amounts for the atom to be "neutral"?
Protons & Electrons
Electrons & Neutrons
The nucleus
Neutrons & Protons
16
Which subatomic particle has the smallest mass?
Proton
Neutron
Electron
17
The term "atom" comes from the Greek philosopher named...
Dalton
Lavosier
Aristotle
Democritus
18
There are two isotopes of Boron, B-10 and B-11. Which isotope must be more common?
Can't Tell
Neither
B-10
B-11
19
Which scientist is responsible for the discovery of the nucleus?
JJ. Thomson
Rutherford
Goldstein
Dalton
20
What is the charge on the proton?
Negative
Neutral
Positive
21
What is the overall charge on the atom?
Negative
Neutral
Positive
