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12 Cards in this Set
- Front
- Back
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How many periods does the modern periodic table have?
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7
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What is the octet rule?
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atoms will gain, lose or share electrons to have 8 valence electrons
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How many meters are in a hectometer?
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100
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The atomic number of Oxygen is 8. How many electrons would O 2- have?
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10
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Use your periodic table to look up the atomic number and atomic mass of Boron. How many protons does Boron have?
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5
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Which of the following elements is a metalloid?
a. copper b. indium c. silicon d. carbon |
b.indium
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How many grams are in 4 kilograms if 1 kilogram = 1000 grams?
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4000kilograms
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In a modern periodic table, elements are arranged in order of?
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atomic number (#of protons)
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The most reactive metals, which are soft and silvery-white are the:
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alkali metals
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Who is credited with first arranging the elements the way they are now arranged on the periodic table?
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Dmitri Mendeleev
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What is a cation?
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atoms that lost electrons
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What do all nonmetals have in common?
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poor conductors. PHs lower than 7
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