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Matter Atoms The Periodic Table
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2,1
Name two pieces of evidence that would prove a chemical
Change has taken place.
Odor, heat, light, change in color…
2,3
What group are the most reactive elements found in?
The least reactive?
Alkali metals; noble gases
3,1
1. Give an example of an endothermic change
2. Give an example of an exothermic change
Ice melting; fireworks
3,2
How do you find the number of neutrons in an element?
Take the element’s atomic mass and subtract the number of protons from it.
3,3
What category (Metals, non-metals, or metalloids) of elements are
the following statements true for?•Usually Solid at room temperature
•ductile and malleable•Good conductors of heat and energy
Metals
5,1
What do we call substances thatcannot be broken down into other substances? (Hint: the
answer is not pure substances)
Elements
5,2
What property of metalloidsmake them useful in computer
Chips?
Varying ability to conduct electricity.
5,3
Which group or family is described by the following
characteristics?•Highly reactive
•Poor conductor of heat and Energy
•7 valence electrons
Halogen Family
5,4
Each family in the periodicTable has its own characteristicProperties bases on the number
of __________
valence electrons