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Radioactivity The spontaneous emission of particles (example; alpha or beta) or rays (gamma) from unstable atomic nuclei
Ion A charged atom or group of atoms; bonded together with an electric charge
Isotope Having the same number of protons but different number of neutrons
Orbital A volume of space in an atom that is occupied by one or two electrons
Electron configuration The arrangement of an atom's electrons in its energy levels
Valence electron Electrons in the outermost shell of an atom
Octet rule Atoms tend to have eight electrons in the outermost shell, or try to
Lone Pair A pair of unshared electrons in the valence shell of an atom: nonbonding pair
Electronegativity The attraction of an atom in a molecule or a bonding pair of electrons
Quantum A discrete unit of energy: one photon
Who discovered radioactivity and why doing what? Becquerel; He was experimenting with fluorescence and sunlight when he used uranium and if fogged his photographic film without any sunlight. Which meant radiation from the uranium caused it.
Particles emitted during decay Positives, negatives, neutrals
Proton positive charged particle with the mass of 1 u located in the nucleus.
Neutron Neutral particle with the mass of 1 u located in the nucleus
Electron negative charged particle with the mass of 1/1837 u located outside the nucleus
atomic number the number of protons in the nucleus
Bohr's explanation of line spectra Electrons cannot have any amount of energy, but specified amounts with a specified value called energy levels. Jumping to the next level by absorbing a quantum of energy. By giving up a quantum it can go to the lower energy level.
Bohr's definition of quantum a tiny unit of energy whose value depends on the frequency of radiation
energy level a specified energy value for an electron. Same as today
Ground state Atoms with their electrons at their situated state
excited state Source supplied energy; causing the electrons to jump energy levels
Why atoms share electrons Each atom wants to fill it's octet
Created by: MrScheib