Science
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Terms
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- atomic number
- number of protons in the nucleus of an atom
- strong nuclear force
- a powerful force of attraction that acts only on the neutrons and protons in the nucleus, holding them together
- Earth's degree of tilt
- 23.5 degrees
- isobars
- lines joining places on the map that have the same barometric pressure
- mole
- the SI base unit used to measure the amount of a substance whose number of particles is the same as the number of atoms in exactly 12g of carbon-12
- covavelent bond
- a bond formed when atoms share one or more pairs of electrons
- valence electrons
- electrons in the outer most energy level of an atom
- Democritus
- figured out that universe was made of indivisible particles
- Dalton
- figured out all atoms of a given element were exactly alike & atoms of different elements could join to form compounds
- Thompson
- used the cathoderay tube experiement to find that negatively charged particles came from inside of atoms & discovered electrons
- Rutherford
- using the gold-foil experiment to discover the nucleus of the atom
- ionic bond
- the attractive force between oppositely charged ions which form when electrons are transferred from one atom to another & stronger than covalent bonds
- metallic bond
- a bond formed by the attraction between positively charged metal ions and electrons around them
- polyatomic ion
- an ion made of two or more atoms
- magnetic bond
- holds two ionically bonded atoms together
- sharing electrons
- holds two covalently bonded atoms together