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matts science 3
Question | Answer |
---|---|
Dmitri Medeleev | created the first valid periodic table of the elements in 1869. |
Atom | are the basic building blocks of matter that make up everyday objects |
Proton | + In the nucleus of the atom |
Neutron | doesnt have a charge,In the nucleus of the atom |
Electron | - are found around the nucleus |
Atomic mass | The mass of an atom, usually expressed in atomic mass units. |
Atomic # | The number of protons in an atomic nucleus |