Test #1 Notes

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Atomic Symbol

Top number is mass #

Bottom number (atomic number) is proton #

Mass #- atomic number =neutron number

If there is a charge minus or add the charge to the proton number

A + charge means minus it from the protons and negative means add it to the protons to figure out electrons

No charge protons= electrons

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Pure substance= elements and compounds

Elements- 1 element= H

Compound= H2O (2 or more different elements)

Mixture= Either homo or hetero

Molecule = any 2 or more atmos such as N2, H2,

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Ions

Na+ means Na loses one electron = Na + e-

Cation loses an electron +

Anion gains an electron -

Held together by electrostatic attractions

Metals to nonmetals

Anions end in IDE

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Formulas

Density = Mass/Volume

when atoms are asked for used Avogadro's number = 6.022 x 10^23

Empirical formula convert to moles and use molar mass

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Naming compounds(Two Nonmetal)

Two nonmetals

nonmetal +root of nonmetal +ide

Mono =1

Di=2

Tri=3

tetra=4

penta=5

hexa=6

hepta=7

octa=8

nona=9

deca=10

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Naming Compounds Ionic

Metal+Nonmetal root ide