Scientists | Subatomic Particles | Numbers in Science | Atomic Absorption and Emission | Potpourri (a little bit of everything) |
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J J Thomson
Who discovered the electron
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proton
What particle in the atom is positively charged?
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protons
Atomic number tells you the number of what in an atom?
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ground state
An electron in its normal energy level is in its?
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an extremely small (invisible), hard, solid, sphere of mass
Describe Dalton's atom
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Democritus
Who was the first person credited with the idea of an atom
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protons and neutrons
What 2 particles in an atom have almost equal mass?
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82
Using a periodic table, how many protons does lead have?
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absorb energy, heat or electricity
In order for an electron to jump to an excited state in an atom, what must they do? This usually comes from?
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nucleus
What is the positively charged center of mass in an atom called?
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Gold Foil Experiment, the nucleus of an atom
What was Rutherford's famous experiment and what did he discover?
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repel
Two electrons next to each other would attract or repel?
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10.81 AMU
What is the average atomic mass of boron?
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Energy, which corresponds to a certain wavelength and frequency of EMR that might be visible.
When an electron falls back to a lower energy state, what do they give off?
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32
How many electrons can be held in the 4th energy level?
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In specific energy levels
Bohr said electrons have to exist where?
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protons and electrons
To be electrically neutral, what two particles must be equal to each other in number?
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16
How many neutrons does a sulfur atom have most of the time?
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anything that gives off light. For example a lightbulb, fireworks, a fire, neon signs, streetlamps, etc.
Name three things that work based on the principle of atomic absorption and emission of energy.
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7 protons and 7 neutrons in the center nucleus of the atom, 2 electrons of the first energy level and 5 electrons on the second energy level
Describe what an atomic diagram of nitrogen would look like
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1. Matter is made of atoms
2. All atoms of an element are identical, but different from a different element's atoms 3. Atoms cannot be broken apart, created, or destroyed 4. Atoms combine in simple whole number ratios to form compounds 5. In a reaction atoms separate, get rearranged, and bond in new ways to form new substances
State any 3 of the 5 parts of Dalton's atomic theory
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isotopes, number of neutrons
chlorine-35 and chlorine-37 are called what? And what is the only thing different about them?
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18, 22, 18
How many protons, neutrons, and electrons does an atom of argon usually have?
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gamma, x-ray, UV, visible light, infrared, microwave, radio
State the types of electromagnetic energy in order from smallest wavelength to longest wavelength.
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39
19K
Write the nuclear symbol for an element with 19 protons, 20 neutrons, and 19 electrons
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