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8th Grade Ch. 14 & 15

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by

Heather D.

on 13 December 2016

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Transcript of 8th Grade Ch. 14 & 15

Elements
a substance that cannot be broken down into simpler substances
There are 118 elements on the periodic table
Dmitri Mendeleev published the first version of his periodic table in 1869--he arranged the table by atomic mass
Henry Moseley improved the table by arranging the elements according to the atomic number rather that the atomic mass
Periodic Table
Atomic number- number of protons in the nucleus
Atomic mass- mass of an element
Periodic table is color coded for metals, metalloids, and nonmetals

Metals
w/ exceptions of mercury, all metals are solid w/ high melting point
they have luster (shiny)
Good conductors of heat and electricity
Malleable (beaten into a thin sheet)
Ductile ( able to be drawn out into a thin wire
Ex. steel, bronze, brass, cooper, iron, lead
Nonmetals
Gases or brittle solids at room temp
Poor conductors of heat and electricity
They are not malleable or ductile
only 17 nonmetals
Carbon, sulfur, nitrogen, oxygen, hydrogen
Periodic Table
Periods are the rows they are labeled 1-7
The groups are the columns are labeled 1-18
Groups 1 and 2 and 13-18 are the representative elements(metals, nonmetals, and metalloids)
Transition elements are groups 3-12(all metals)
Some transition elements are called the inner transition elements (below the table
First row is called the lanthanide
second row is called the actinide series
8th Grade Ch. 15
Objectives:
Predict the properties and interactions of given elements using the periodic table
metals and nonmetals
acids and bases
Chemical changes in matter( rusting, combustion, food spoilage)

Metalloids
Between the metals and nonmetals on the table
Share some characteristics of metals and nonmetals
some are semi-conductors
Ex. boron, silicon, germanium
Boron- used in rocket fuel ignite
Silicone- ceramic, computer chips, sand, glass
Germanium- camera lenses, fluorescent lamps
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