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Name: _________________________________________ Period: ____ Date: _______ Notes # _____
Ch 1.1 PowerPoint Notes: Atoms are the smallest forms of elements
Atomic Structure
ATOMS
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All _____________ is made of tiny particles called _________.
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All atoms have a _________ called a __________________.
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The __________________ contains __________________ and
__________________.
PROTONS & NEUTRONS
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__________________ are particles with __________________electric charges (+).
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__________________ are particles with _____ electric charges.
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Protons and neutrons have __________________ masses and together make up the ________ of an
atom.
ELECTRONS
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An __________________ has a __________________ charge (–) and a very __________ mass.
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Electrons move so _________ it is hard to pinpoint their location.
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Not all electrons in an electron cloud have the same energy.
ELECTRON ENERGY LEVELS
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In atoms, __________________ are at _________ energy levels.
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The _____ energy level is closest to the nucleus and holds up to _____ electrons.
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The _____ level holds _________, the _____ holds up to _____ or _____.
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_________ levels hold up to _____ or up to _____ or __________.
Draw correct number of electrons
MASS OF AN ATOM
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The mass of a proton is much ________________ than the mass of an electron.
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The positive _____________ of a proton is ___________ to the negative _____________ of an electron.
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In a _____________ atom there are ___________ numbers of protons and electrons.
Atoms
Draw & label the parts of an atom
Circle your level of understanding of these concepts:
1
2
3
4
Elements & Chemical Symbols
ELEMENTS
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Elements are made of only _____ type of atom.
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Oxygen, carbon, and hydrogen are examples of _______________.
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Example: Carbon is made of only carbon atoms.
CHEMICAL SYMBOLS
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The name of an element can be represented by a chemical _____________.
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When ______ letter is used as a symbol it is a _____________ letter.
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Example: oxygen is ___, hydrogen is ___, & carbon is ___.
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When a symbol contains _____ letters, the _____ letter is a _____________ and the _____ is in
_____________ case.
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Example: helium is _____, chlorine is _____, & lithium is _____.
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Most symbols come from the ________________ name of the element; some come from the
_____________ name.
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The ________________ is the one or two letter abbreviation for the element.
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O = Oxygen; K = ________________; Cl = Chlorine; Na = ________________; S = _______________
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The ________________ is the one or two letter abbreviation for the element.
SYMBOL BOX
2
He
Helium
4.00
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Atomic Number: the ________________ of ________________ in an atom found in the nucleus.
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Helium has _____ protons, so its atomic number is ____.
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Atomic mass: the average number of ________________ and ________________ in an atom.
This is the ________________ mass of the element compared to ________________ as a standard.
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Mass number: ____________ number of ________________ and ________________ in an atom.
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Atomic Number = # of Protons = # of Electrons
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ATOMIC MASS (AVERAGE- ___________________)
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MASS NUMBER (________________ NUMBER)
= # of Protons + # of Neutrons
OR = (# of Electrons) + (# of Neutrons)
OR = (Atomic Number) + (# of Neutrons)
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Subtracting the # of ________________ (atomic # or # of electrons) from the _______ number, will
give you the # of ________________.
HISTORICAL FACTS OF THE PERIODIC TABLE
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By the middle of the 19th century, a number of elements had been discovered.
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Dmitri ________________________, a Russian scientist, arranged the elements into the Periodic Table.
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Certain ________________ properties were repeated regularly.
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These properties were related to the _______ of the protons and neutrons in an atom.
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Mendeleev’s table contained the 65 elements then known and ___________ spots where he
________________ the properties of elements not yet discovered.
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Some problems occurred with his arrangement. As a result, today’s classification system is based on the
____________ numbers of elements.
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This organization of elements is called the ______________________________________.
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Scientists have discovered _____ substances called ________________.
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____ of these occur ______________________, the rest are made in laboratories.
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An ________________ is a substance that ________________ be broken into ________________
substances.
ISOTOPES
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Atoms of the _______ element ________________ have the _______ number of ________________.
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All atoms of the _______ element do ______ always have the same number of ________________.
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Isotopes: atoms of the same element with _______________________ numbers of ________________.
METALS
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H
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Zn zinc
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Co cobalt
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Na ________________
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Ag ___________
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Au __________
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Mg magnesium
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Cu copper
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Al aluminum
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K ________________
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Mn manganese
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Sn ______
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Ca calcium
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Li lithium
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Hg ________________
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Ba barium
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Pb _______
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Fe _______
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Ni nickel
hydrogen
NON-METALS
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Cl ________________
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N nitrogen
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Rn _____________
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F fluorine
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P ________________
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C
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Br bromine
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He helium
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Xe _____________
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O ________________
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B boron
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Ar argon
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S
sulfur
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Si _____________
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I iodine
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Ne neon
carbon