The Atom Ch.17 Sec.1.

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Presentation transcript:

The Atom Ch.17 Sec.1

Atom Contain a nucleus, protons, neutrons, and electrons

Nucleus Center of atom Positive (+) charge Contains protons and neutrons

Protons (p+) Protons = Positive Charge (1+) Relative Mass: Actual Mass = 1 (compared to other subatomic particles) Actual Mass = 1.674 x 10-24 Location = nucleus Number of protons varies w/ ea. element

Neutrons (no) Neutrons = Neutral Charge (none or zero) Relative Mass = 1 Same as proton Actual Mass = 1.675 x 10-24 Location = nucleus

Electrons (e-) Electron = Negative charge (1-) Relative Mass = 1/1836 Actual Mass = 9.11 x 10-28 Location = electron clouds or orbits Constantly move around nucleus

Atoms Are Neutral # of Protons (+) = # of Electrons (-) Neutrons do not matter because they do not have a charge Ex: Helium: 2 P - (+2) 2 N - (0) 2 E - (-2) 0 overall charge

Neutral Atom 3 Protons (+3) 4 Neutrons (0) 3 Electrons (-3) = 0 overall charge

Changing Particle #s Cannot change p+ # (diff. element) n0 can change (neutral don’t matter) Isotope E- # can change Lose, gain share e- when bonding