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Matter Molecules Atoms protons + neutrons + elect quarks and leptons Molecules Atoms protons + neutrons + elect Realm of Chemists The Atom Rutherford STM - scanning tunneling microscopy (o JJ Thomson Particle Mass Electrons 9.11x10 -31 kg -1 Protons 1.67x10 -27 kg +1 Neutron 1.67x10 -27 kg 0 Tutor ial Structure of the Atom 4 He nucleus electr cloud

Matter Molecules Atoms protons + neutrons + electrons quarks and leptons Molecules Atoms protons + neutrons + electrons Realm of Chemists

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Page 1: Matter Molecules Atoms protons + neutrons + electrons quarks and leptons Molecules Atoms protons + neutrons + electrons Realm of Chemists

Matter Molecules Atoms protons + neutrons + electrons

quarks and leptons

Molecules Atoms protons + neutrons + electrons

Realm of Chemists

The Atom

Rutherford

STM - scanning tunneling microscopy (of Si)

JJ Thomson

Particle Mass ChargeElectrons 9.11x10-31kg -1 Protons 1.67x10-27kg +1Neutron 1.67x10-27kg 0

Tutorial

Structure of the Atom

4He

nucleus

electroncloud

http://dbhs.wvusd.k12.ca.us/AtomicStructure/Greeks.html

Page 2: Matter Molecules Atoms protons + neutrons + electrons quarks and leptons Molecules Atoms protons + neutrons + electrons Realm of Chemists

A. Atomic Number (Z) = #protons in an atom’s nucleus

C. Mass Number (A) = # of protons + # of neutrons

XAZ

Atomic number

Mass number

Element

1. Isotopes - atoms of the same element with different numbers of neutrons (same Z different A)

B. Element - a substance whose atoms all have the same number of protons

D. Atomic Symbols

nucleus

4He 3He

Atomic Number (Z)

Page 3: Matter Molecules Atoms protons + neutrons + electrons quarks and leptons Molecules Atoms protons + neutrons + electrons Realm of Chemists

Symbol # of protons # of neutrons # of electrons

Ni10 10

5928

Exercises

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