Elements
compounds
atoms
properties of elements
periodic table
100
can not
What is elements are pure substances that ________ be broken down
100
compound
What is formed by the chemical combination of two or more elements
100
protons
What is have a positive charge
100
metals
What is can be worked into different shapes
100
left
What is metals are located here
200
symbol
What is each element is given a special _______ of one or two letters
200
true
What is compounds don't have the same properties as the individual elements that make them up
200
electrons
What is have a negative charge
200
metals
What is are solid at room temperature
200
right
What is the location on nonmetals
300
subscripts
What is numbers below element symbols
300
capital
What is an element's first symbol is always
300
neutrons
What is have no charge
300
metalloids
What is the elements in the middle
400
protons
What is the number of these determine what element it is
400
atom
What is the smallest unit of an element that retains the properties of the elelment
400
chemical reactivity
What is the first we learned about
400
Mendeleyev
What is the person who created it
500
three fourths (75%)
What is the percent of elements that are metals
500
scanning tunneling microscope
What is the instrument used to see images of atoms
500
protons and neutrons
What is the parts of the nucleus of an atom
500
hydrogen
What is the lightest of all known gases
500
true
What is metals conduct electricity well
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