Pure substance – element and compound

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Presentation transcript:

Pure substance – element and compound Sodium bicarbonate NOT solutions (small %compound, large %water)

history Dalton – dot Thomson – electron, cathode ray Rutherford – nucleus, empty space, gold foil Neutron after (chadwick) Bohr – quantized energy with light Quantum model - orbitals

atomic structure cobalt – 58 : mass number p + n Atomic number = protons and electrons in neutral Weighted average based on the % abundance data of isotopes Isotopes!

Ionic vs. covalent bonding Ionic: transfer, covalent: share. Ionic: low and high EN, covalent both high EN Ionic: crystal lattice, strong bond, covalent: molecule, weaker bond

Periodic trends Ionization: increases across, decreases down Radius: decreases across, increases down Biggest: N, O P, S? Rb, Sr, S, Cl? Smallest ionization: N, O, P, S? Biggest ionization: Rb, Sr, S, Cl?