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A Greek philosopher who believed all things on Earth were made of four elements: air, earth, fire and water.
six elements making up most of the human body
oxygen, carbon, hydogren, nitrogen, calcium, phosphorus
the smallest particle of an element that still has the same chemical properties of the elements.
Greek philosopher that believed matter could be cut into smaller and smaller peices only up to a certain point.
These fired helium atoms at gold foil and found most went through the foil, some bounced back.
number of electronics in an atom
this does not change an atom's atomic number. they have virtually no mass.
a chart which shows the elements in the order of increasing atomic number. It is organized by a) physical properties and b) the number of protons
these conduct heat and electricity, become shiny when polished, melt at high temperatures and can be easily reshaped.
contains sodium and chlorine (Na, Cl). Good example of a compound whose properties are quite different from the elements comprising the compound.
A chemical formula showing compound with elements in a 1-to-1 ratio. It is held together by their opposite charges.
the smallest particle of a compound that still has all the qualities of that compound. Their atoms are so tightly bonded that they act like a single particle.
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