# The Atom the smallest unit of an element protons and neutrons in nucleus surrounded by one or > shells of electrons neutral atoms: # protons = # electrons.

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The Atom the smallest unit of an element protons and neutrons in nucleus surrounded by one or > shells of electrons neutral atoms: # protons = # electrons

Protons Pro=For=Positive Nucleus a positively charged particle in the nucleus of an atom protons + neutrons = atomic mass # protons = atomic # P+

Neutron neutral=neither positive nor negative a neutrally charged particle in the nucleus of an atom can be > neutrons than protons protons + neutrons = atomic mass P+ N Nucleus 12 C or C-12 14 C or C-14 Carbon has 6 protons. How many neutrons?

Electron electricity-zaps-ouch-negative shell outside nucleus a negatively charged particle surrounding an nucleus of an atom neutral atom: electrons = protons e-

Atomic Number, Atomic Mass, P+, N, e- What determines the atomic number The number of protons in an atom What determines atomic mass The number of protons and neutrons Where is the proton found and what is its charge? Nucleus, positive Where is the neutron found and what is its charge? Nucleus, neutral Where is the electron, and what is its charge? Around nucleus, negative

Isotopes : an atom of an element that can have different numbers of neutrons Neutrons, > neutrons, even > neutrons but still same element 6 protons 6 neutrons 6 electrons 6 protons 7 neutrons 6 electrons 6 protons 8 neutrons 6 electrons

Ions All About Electrons Coming and Going a charged particle that has either more or fewer electrons than protons positive or negative depending on whether electrons are gained or lost Cation Carry away electron More protons than electrons Electrons lost Anion A Negative Ion More electrons than protons Electrons gained e-

Ion Examples Sodium and Fluorine NaNa+ Lose e-, go positive FF- Gain e-, go negative

Isotopes and Ions What is an isotope? An atom of an element that can have different numbers of neutrons. What is an ion? A charged particle that has either more or fewer electrons than protons because electrons have been gained or lost.

Review Website Review vocabulary at quizlet.com. Search mrpolinski to find my sets.

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