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15
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If an element has 3 electron shells and 2 valence electrons, what group and period does it belong to?
Period 3, group 2
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How many periods and groups are there in the periodic table?
7 period and 18 groups
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This is the ONE VARIABLE that is CHANGED in a fair test.
Independent variable
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What are metalloids (semi-metals)
Metalloids are ELEMENTS that HAVE SOME PROPERTIES OF METALS, and SOME PROPERTIES OF NON-METAL
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Physical properties of metals
Lustrous (shiny) • Good conductor of electricity • Solids with a high melting point • Malleable (can be shaped)
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Any matter which has a specific COMPOSITON and specific PROPERTIES
SUBSTANCE
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Physical properties of non-metals
• Dull (not shiny) • Insulators (poor conductor of electricity) • Substances with low melting point • Brittle when solid (breaks easily)
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the electrons in the outermost shell.
Valence electrons
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List 3 of the groups in the periodic table.
Alkali metals, alkaline earth metals, halogens, the noble gases...
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lifesaver
Give 25 points!
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fairy
Take points!
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25
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gift
Win 20 points!
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banana
Go to last place!
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Elements that do NOT FIT into the category of METALS OR NON-METALS.
Metalloids
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The PHYSICAL CHARACTERISTICS of an element that can be OBSERVED with OUR SENSES .
Physical properties
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thief
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25
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star
Double points!
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gift
Win 15 points!
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banana
Go to last place!
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trap
No points!
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magnet
Take 15 points!
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gift
Win 5 points!
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thief
Give points!
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15
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25
15
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a simple way to draw the electrons of an element.
Shell models
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15
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TWO OR MORE SUBSTANCES that are combined, but NOT CHEMICAL BONDED
MIXTURES
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