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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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The modern periodic table has 7 periods.
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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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. Which of the following elements is a metalloid?
a. copper b. indium c. silicon d. carbon |
C. Silicon
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In a modern periodic table, elements are arranged in order of?
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The Atomic Number and number of Protons
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What is a Cation ?
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Atoms that loose electrons
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What is the Octet rule ?
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Atoms will lose, gain or share electrons in order to achieve a full set of 8 valence electrons
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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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Dimitri Mendeleeve
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How many grams are in 4 kilograms if 1 kilogram = 1000 grams?
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400 grams
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How many meters are in a hectometer?
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100 meters
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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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Atomic Number: 5
Atomic Mass: 10 Protons: 5 |
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Why are noble gases so unreactive?
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Noble gases are so unreactive because they dont have electronegativity because they dont pull on other electrons at all
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The pull of an atom on another atom’s electrons is known as what?
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Electonegativity
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