Term
What is an atom?
What is it composed of? |
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Definition
1)Smallest particle of an element that retains all its properties
2) Electrons, Protons, and Neutrons |
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Term
How is the charge for a Proton written?
How is the charge for an Electron written?
How is the charge for a Neutron written? |
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Definition
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Term
| How can you tell if atoms are from another element? |
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Definition
| By the number of protons it has |
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Term
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Definition
| 1) # of protons, (also # of electrons) |
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Term
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Definition
| 1) # of protons + # of neutrons |
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Term
For the element Cobalt:
The number on the top is the?
The number on the bottom represents the?
Co is the _______ for the element. |
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Definition
[image]
*Note: ignore the numbers on the right
1) Atomic number
2)Mass number
3)Chemical Symbol
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Term
# of protons/electrons= ?
# of neutrons= ? |
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Definition
1) Atomic number
2)Mass number - # of protons (atomic number/electrons) |
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Term
What is the significance of Democritus?
At what time did he make his "discovery"?
What does Atoma mean? |
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Definition
1)Developed the idea of atoms by pounding up material until it couldn't get smaller
2) around 400 BC
3) Indivisible |
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Term
What was John Dalton's discovery?
When did this take place? |
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Definition
1) all matter made up of tiny spheres and bounced around with perfect elasticity/ called them atoms
2) 1808 |
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Term
What did Joseph John Thompson come up with?
When did this take place?
What was his model called?
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Definition
1)electrons existed and they were spread unevenly throughout the atom surrounded by a + charge
2)1898
3) Plum Pudding Model |
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Term
What was Robert Milkan famous for?
When did this happen? |
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Definition
1) Determining the charge on the electron
2) 1909 |
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Term
What was Ernest Rutherford famous for?
This happened in what year? |
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Definition
1) Gold foil experiment to develop a new atomic model saying atom had a central nucleus that contained the positive charge
2) 1910 |
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Term
Proton: Charge =? Relative Mass =? Actual mass =?
Neutron: Charge =? Relative Mass =? Actual mass =?
Electron: Charge =? Relative Mass =? Actual mass =? |
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Definition
1) 1+ (positive charge), 1, 1.673 X 10-24 g
2) no charge, 1, 1.673 X 10-24 g
3) 1- (negative charge), 1/1840, 9.11 X 10-28 g |
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Term
| In Hyphen notation, the number following the element name is the? |
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Definition
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Term
In Symbol notation, what number is on top?
On bottom?
What is in the middle? |
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Definition
1) Mass number
2) Atomic number
3) Element's symbol |
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Term
How would Helium- 89 be written in Symbol notation?
(Atomic number is 2). |
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Definition
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Term
How would: 67H
1
Be written in Hyphen notation? |
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Definition
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Term
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Definition
| Atoms with same * protons/electrons, but different number of neutrons ///// same element but different mass numbers |
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Term
The atomic mass is what?
This is determined by? |
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Definition
The average of all the atomic masses of the isotopes
An isotopes contribution by its relative abundance |
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Term
| What is the formula for calculting atomic mass? |
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Definition
| Weighed average= (mass isotope X %) + (mass isotope X %) + ... etc |
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Term
Chemical reactions involve only the?
This means what? |
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Definition
1) electrons
2) atoms do not change into another element |
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Term
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Definition
| Process where a substance emits radiation spontaneously |
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Term
| What is different from a nuclear reaction than a chemical reaction? |
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Definition
| Nucleus changes making atoms change into atoms of another element. (not just electrons, involves protons and neutrons too) |
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Term
| What are the 3 types of Radiation? |
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Definition
1) Alpha
2) Beta
3) Gamma |
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Term
What happens during Alpha decay?
How is it represented in a nuclear equation? |
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Definition
1)Atomic number decreases by 2 (loses 2 p+)
2)Atomic mass decreases by 4 ( loss 2 p+ and 2n = 4amu)
3) 4 He
2 |
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Term
What happens during Beta Decay?
How is it represented in a nuclear equation? |
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Definition
1) Atomic number increases by 1 (gained 1 p+)
2) Atomic mass stays the same
3) 0
e or β
-1 |
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Term
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Definition
| 1)Rays that have no mass that accompanies alpha/beta radiation |
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Term
| Overall, in Alpha decay; the nucleus emits what? (besides an alpha particle) |
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Definition
| 1) 2 protons and 2 neutrons |
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Term
| Overall, in Beta Decay, what is emitted? (besides beta particle) |
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Definition
| 1)neutron turns into a proton and then the electron is given off |
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Term
| In a Nuclear Equation, what is conserved? |
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Definition
1)Atomic Number
2)Atomic Mass |
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