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According to Leucippus, Democritus, and Ludretius,all matter is made of...
Atoms
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According to John Dalton, the most important property of an atom is the...
weight
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What is... A clearly-stated tentative explanation, a conjecture (must be testable)
Hypothesis
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What is... A mathematical summary of an observed of an pattern of facts.
Law
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What is... A well-tested and well-supported possible explanation.
Theory
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What is... Something detected and recorded.
Observation
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What is... A guiding model or set of models and theories which show a range of new ideas to test.
Paradigm
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What is... A mental image or imagined picture of how something works or is connected or a mathematical explanation of how it works or a physical mechanism that illustrates how it works.
Model
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What is... A reproducible observation; something for which we have reproducible evidence.
Fact
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To become a cation, an atom must...
lose electrons
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To become an anion, an atom must...
gain electrons
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To become a lighter element, an atom must...
lose protons
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To become an heavier element, an atom must...
gain protons
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To become lighter isotope, an atom must...
lose neutrons
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To become a heavier isotope, an atom must...
gain neutrons
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Radioactivity that is stopped by an Al sheet, but passes through paper is...
Beta radiation
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Radioactivity that is stopped by paper or cardboard is...
Alpha radiation
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Electromagnetic radiation useful for detecting bones beneath skin is...
X-Rays
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Radioactivity that does not have a negative or positive charge is...
Gamma radiation
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Electromagnetic radiation with wavelengths just longer than visible light is...
IR radiation
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Electromagnetic radiation with energies just rather than visible light is...
UV radiation
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Regions of electromagnetic radiation in order...
Radiowaves, Infared, reed, green, purple, ultra violet, x-rays, gamma rays
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Of the two most abundant gases in the Earth's atmosphere, the more reactive one is...
O2
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Of the two most abundant gases in the Earth's atmosphere, the nearly inert one is...
N2
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The most abundant gas in the Earth's atmosphere is...
N2
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The second most abundant as in the Earth's atmosphere is...
O2
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An allotrope is
A different structural form of the same element in the same phase.
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A metalloid element frequently has...
One allotrope that is metallic and another that is non-metallic
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What is a true description of the atmosphere of stars and the atmosphere of planets?
Stars have ions and molecular fragments, planets have mainly molecules and noble gas atoms.
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Which one of the Earth's atmosphere layers fits this description: Has the most charged particles and molecule fragments.
ionsphere
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Which one of the Earth's atmosphere layers fits this description: Has the most weather and most turbulence.
Troposphere
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Which one of the Earth's atmosphere layers fits this description: Layer of the atmosphere that is closest to the Earth's surface
Troposphere
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Which one of the Earth's atmosphere layers fits this description: Has calm air (less winds and weather) and absorbs UV rays
Stratosphere
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Which one of the Earth's atmosphere layers fits this description: Greek root means "turning", implying convection
Troposphere
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Which one of the Earth's atmosphere layers fits this description: Latin root means "layer", implying a "quiet layer"
Stratosphere
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Ductile means....
that the element is so soft you can cut it with a butter knife.
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define isotope:
an isotope is an atom with a different mass of the same element.
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