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Reassessment Requirements for Elements Test
To view this slide show properly make sure to click “Slide Show” and then “From Beginning”.
Go through each slide and CAREFULLY read each slide and THINK about what you are reading.
Take notes of the important information on each page.
The Periodic Table of Elements
An element is a substance that is made from one kind of atom only. It cannot be broken down into simpler substances.
An element
An element
atom atom
ElementsElements are PURE SUBSANCES made of only one type of atom.
So chemists do not have to write out the whole name of an element, they are represented by symbols of one or two letters.
*An element symbol only contains one capital letter!
Classifying Elements on the Periodic Table
Metals
Properties of MetalsMetals appear to the left of the dark ziz-zag
line on the periodic table. Most metals are solid at room temperature.
METALS
Properties of Metals
Metals have
luster. This means they are
shiny
Properties of Metals
Ductilemetals can be drawn into wire.
Properties of Metals
Malleablemetals can be hammered into sheets
Properties of Metals
Metals have a high melting point.
They are also very dense.
Properties of Metals
Conductors Metals are
good conductors of electricity and heat
Properties of Metals
A chemical property of metal is its reaction with water and oxygen. This results in corrosion and rust.
Nonmetals
Properties of Nonmetals
Nonmetals occur to the right of the dark zig-zag on the periodic table. Although Hydrogen is in family 1, it is also a nonmetal. Many nonmetals are gases at room temperature.
NONMETALS
Properties of Nonmetals
Nonmetals do not have luster; they are dull.
Properties of Nonmetals
BrittleNonmetals are
brittle so they break easily. This means nonmetals ARE NOT ductile or malleable.
Properties of Nonmetals
Nonmetals have low
density.
Properties of Nonmetals
They also have a low melting point. This is why they are poor conductors of heat and electricity.
Metalloids
Properties of Metalloids
Metalloids can be found clustered around the dark zig-
zag line that separates metals and nonmetals.
METALLOIDS
Properties of Metalloids
Metalloids have properties of both metals and nonmetals.
Properties of Metalloids
Metalloids are solids that can be
shiny or
dull.
Properties of Metalloids
They conduct
electricity and heat better than nonmetals but not as well as
metals.
Properties of Metalloids
Silicon for example has a shiny metallic luster and is a medium conductor BUT it is brittle and shatters when you hit it with a hammer.
PRACTICE!Read the description of the element and decide if it is a metal, nonmetal,
or metalloid by it’s properties. Click to check your answer.
Hydrogen – clear, no luster, gas
Magnesium – shiny luster, malleable, good conductor
Arsenic – shiny luster, brittle
Carbon – black, dull luster, brittle
Lead – very dense, shiny luster, malleable
NONMETALNONMETALMETALMETALLOID
Elements & Compounds
The elements, alone or in combinations, make up our bodies, our world, our sun, and in fact, the entire universe.
Elements & CompoundsWhen elements
chemically combine to make different substance it is called a compound.Compounds are made of two or more elements joined.Compound formulas are written by combining the element symbols together.
A compound is a substance that is made from more than one element.
atom atom
A compound made up of 2 different elements
A compound made up of 7 different elements
A compound can be broken down into the elements that make it up.
A compound made up of 3 different elements
An element
An element
An element
PRACTICE!On the next slide is a
COMPOUND or ELEMENT practice chart.
Read the information given in a row and decide whether it is an element or a compound.
Click to check your answer.
Material Made up of: Element or compound
Water Hydrogen and Oxygen
Coal Carbon
Carbon dioxide
Carbon and Oxygen
Oxygen Oxygen
Chalk Calcium, Carbon & Oxygen
Wax Carbon & Hydrogen
Table salt Sodium & Chlorine
Helium Helium
Compound
Compound
Compound
Compound
Compound
Element
Element
Element
33
PRACTICE READING COMPOUNDS!Read the compound formula and see if you can figure out HOW MANY
ELEMENTS are in it and WHICH ELEMENTS they are. Click to check your answer.
NaHCO₃
NaCl
C₆H₉O₆
4 – sodium, hydrogen, carbon, oxygen
2 – sodium, chlorine
3 – carbon, hydrogen, oxygen
