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Taylor Chapt 10/2

Elements and atoms

Element The basic building blocks of all matter. They are pure substances and cannot be broken down into simpler substances.
Substance One type of matter.
Compound Any substance that is formed by a chemical combination of two or more elements. Can only be broken apart into similar substances by chemical reaction. They have different properties thatn the elements that make them up.
Chemical Formula symbols for compounds
Subscripts Numbers below the element symbols. It tells us the number of particals that combine in the compound.
Atomic number the number of protons in an atom determins what element it is.
Neutral an atom that has the same number of protons and electrons.
Positive charge when an atom looses electrons and is left with more protons.
Negitive charge when an atom gains electrons and is left with more electrons.
Repel atoms with the same charge. They push apart
attract atoms with opposite charges. they move together.
positive and positive atoms repel
negitive and positive atoms attract
Nutral either a positive or a negitive charge will attract this type of atom.
N- or N+ attract
Molecules particles that contain more than one atom joined together.
Molecules of elements always contain only one kind of atom.
Molecules of compounds have different kinds of atoms joined together.
Atom the smallest unit of an element that has the same properties of the element. So small they cannot be seen through a regular microscope
Nucleus the center ball that holds positive neutrons
Protons equal one positive charge (+)
Neutrons equal no charge
Electrons equal one negative charge (-)
Created by: hdePadua