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22 Cards in this Set
- Front
- Back
How was Mendeleev's periodic table arranged? |
By increasing atomic mass |
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What are the two most common alkaline earth metals? |
Calcium and Magnesium |
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More than half of of the nonmetals are __________ at room temperature. |
gases |
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Bohr's Model |
A model whose electron orbits look like planets orbiting the sun or layers of an onion. |
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Family or group |
A column of elements in the periodic table. |
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What does the atomic number of an element stand for? |
The number of protons in the nucleus. |
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What are beta radiation particles identical to? |
Electrons |
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What are Isotopes? |
Atoms with the same number of protons, but different numbers of neutrons. |
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What can you predict from an element's location on the periodic table? |
The element's properties |
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What elements generally do not form compounds? |
The noble gases |
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Name two ways that protons and neutrons are alike? |
They have about the same mass and both are found in the nucleus. |
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What are three properties of metals? |
Metals are malleable, ductile, and can carry an electric current. |
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What are models? |
Representations of an idea to help scientists understand what they cannot directly observe. |
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Chemical Symbol |
A one or two letter representation of an element. |
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Conductivity |
To easily transmit electricity and heat. |
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Radioactivity |
The spontaneous emission of radiation by an unstable atomic nucleus. |
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Periods |
The horizontal rows in a periodic table. |
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On what side of the periodic table are the nonmetals located? |
The right side of the periodic table. |
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What is used to organize the modern periodic table? |
The atomic number |
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Why is the mass of an electron not used in determining the mass of an atom? |
The mass of an electron is lower than the mass of a proton or neutron and will not make a big enough difference to the total mass. |
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How can an atom have no charge when it is made of protons, neutrons and electrons? |
If an atom has the same number of protons and electrons; the negative and positive charges balance out and neutrons have no charge. |
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Why is it not necessary for electrons to be included in determining the mass? |
Since the mass of an electron is smaller than protons or neutrons it will not add enough to the total mass to make a difference. |