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Taylor Chapt 10/2
Elements and atoms
Question | Answer |
---|---|
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 (-) |