The Atom Chapter 11 Section 2 What is an atom made of Inside the Nucleus Atomic Mass Unit unit of mass that describes the mass of an atom or molecule Protons POSITIVE charge 1 proton 1amu ID: 770179
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The Atom Chapter 11 Section 2
What is an atom made of? Inside the Nucleus Atomic Mass Unit – unit of mass that describes the mass of an atom or molecule. Protons = POSITIVE charge (1 proton = 1amu.) Neutrons = NEUTRAL charge (1 neutron = 1amu.) Outside the Nucleus: Electrons = NEGATIVE charge – found in the electron cloud (levels)
Parts of an Atom + + N N PROTON NEUTRON ELECTRON NUCLEUS ELECTRON CLOUD
Electrical Charges of an Atom Equal #’s of protons (+) and electrons (-) will cancel each other out to create a NEUTRAL atom. …more protons than electrons = POSITIVE atom …more electrons than protons = NEGATIVE atom PROTON ELECTRON NEUTRON NEUTRAL ATOM NEGATIVE ATOM
Terms to Know… Atomic Number – tells you the number of protons in and atom. Mass Number – the sum of the numbers of protons and neutrons in the nucleus of an atom. + + N N N + - - - Atomic Number = 3 Mass Number = 6
You Try!... + + + N N - - - Atomic Number: ______ Mass Number: _______ Atomic Number: ______ Mass Number: _______ ATOM #1 ATOM #2
Terms to Know… Isotope …an atom that has the same number of protons (or the same atomic #) as other atoms of the same element, but has a different number of neutrons (and thus a different atomic mass)