7th grade ch 3 sec 1 introduction to atoms
TRANSCRIPT
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Ch. 3Sec. 1
Introduction to Atoms
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central core of atom
no charge
positive charge
negative charge
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Helium
Electrons move within a sphere shaped region around the nucleus.
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•# of protons in atom’s nucleus
•used to identify element
Atomic mass number
•sum of protons & neutrons
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isotope-
element with same # of protons & different # of neutrons
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Model Brief description
Picture
Dalton model Atoms all alike
Diff. elements-diff. masses
Thomson model
Nagaoka model
Rutherford model
Bohr model
Chadwick model
Present Modern model
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Were you paying
attention?
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Protons, neutrons and electrons
• What are the three main particles in an atom?
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proton- positive chargeneutron- no charge
electron- negative charge
• How do the particles of an atom differ in electric
charge?
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Each atom has equal numbers of positively charged protons and negatively charged electrons.
• Why do atoms have no electric charge even though most of their particles have
charges?
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The number of protons in each atom of that element.
• What is the atomic number of an element?
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Each element has a unique atomic number because all atoms of that element have the same number of
protons.• How can atomic numbers be
used to distinguish one element from another?
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Each atom of nitrogen-15 contains 7 protons, 8 neutrons and 7 electrons.
• The atomic number of the isotope nitrogen-15 is 7.
How many protons, neutrons and electrons make up an
atom of nitrogen-15?
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Each atom of nitrogen-15 contains 7 protons, 8 neutrons and 7 electrons.
• The atomic number of the isotope nitrogen-15 is 7.
How many protons, neutrons and electrons make up an
atom of nitrogen-15?
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Atoms are too small to be seen.
• What is the main reason that scientists use models to
study atoms?