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Matter & Energy

Chapter 2

matter anything that occupies space and has mass(weight)
elements fundamental units of matter
subatomic particles nucleus,protons,neutrons,orbiting the nucleus,electrons
atomic number equal to the number of protons that the atoms contains
atomic mass number sum of the protons & neutrons
isotopes atoms of the same elements with the same number of protons and the same atomic number -vary in # of neutrons
radioactivity radiosotope,heavy isotope,tends to be unstable,decomposes to more stable isotope
radioactivity process of spontaneous atomic decay
molecule two or morre atoms of the same elements combined chemically
compound two or more atoms of different elements combined chemically
chemical reaction atoms are united by chemical bonds atoms dissociate from other atoms when chemical bonds are broken
electrons and bonding electrons occupy energy levels called electrons shells electrons closely to the nucleus are most strongly attracted each shell has distinct properties the number of electrons has a upper limit
Created by: Jourdie



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