Transcript The Simplest Matter

The Simplest Matter
SWBAT describe the relationship between
elements and the periodic table; explain the
meaning of atomic mass and atomic number;
identify what makes an isotope; contrast
metals, metalloids, and nonmetals
One kind of atom
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Element
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matter made up of only one kind of atom.
Atomic number
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tells us the number of protons in the nucleus
of an atom.
How many protons do the given
elements have?
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Calcium
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Titanium
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20
22
Oxygen
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8
Definitions
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Isotope
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Mass number
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atoms of the same element that have
different numbers of neutrons.
the number of protons plus the number of
neutrons an atom contains.
Atomic mass
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the weighted average mass of the isotopes of
an element.
How many neutons do the given
elements have?
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Calcium
Atomic number is 20
 Mass number of 40
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Titanium
Atomic number is 22
 Mass number is 45
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Oxygen
Atomic number is 8
 Mass number is 15
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Metals
Have a shiny or metallic luster.
 Are good conductors of heat and
electricity.
 Most are solids at room temperature.
 Are malleable - meaning they can be bent
or pounded into anther shape.
 Are ductile - meaning they can be drawn
into wires without breaking.

Nonmetals
Usually dull in appearance.
 Most are poor conductors of heat and
electricity.
 Many are gases at room temperature.
 The solid ones are brittle - they break
easily
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Metalloids
Elements that have characteristics of
metals and nonmetals.
 Are solids at room temperature.
 Some are shiny.
 Many are conductors - but not as good as
metals are.
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