Chapter 2

Chapter 2: Atoms and Elements

Radioactivity ,[object Object],[object Object]

ATOMIC COMPOSITION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A TOM COMPOSITION ,[object Object],[object Object],[object Object],[object Object],The atom is mostly empty space

[object Object],[object Object],[object Object]

[object Object],[object Object]

Atomic Number, Z ,[object Object],13 Al 26.981 Atomic number Atom symbol Atomic weight

Atomic Weight ,[object Object],[object Object],[object Object]

Mass Number, A ,[object Object],[object Object],[object Object],[object Object]

Isotopes ,[object Object],[object Object],[object Object],10 B 11 B

Isotopes ,[object Object],[object Object],[object Object],[object Object],[object Object],10 B 11 B

Isotopes & Atomic Weight ,[object Object],[object Object],[object Object],[object Object],[object Object]

Counting Atoms ,[object Object],1 mole is the amount of substance that contains as many particles (atoms, molecules) as there are in 12.0 g of 12 C. MOLE

Particles in a Mole ,[object Object],Avogadro’s Number There is Avogadro’s number of particles in a mole of any substance. Amedeo Avogadro 1776-1856

Molar Mass ,[object Object],[object Object],[object Object]

PROBLEM: What amount of Mg is represented by 0.200 g? How many atoms? ,[object Object],= 4.95 x 10 21 atoms Mg How many atoms in this piece of Mg?

Periodic Table ,[object Object],[object Object]

Chapter 2

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Chapter 2

Editor's Notes