the periodic table of elements 8 th grade science ms. kindregan
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The Periodic Table of Elements 8 th Grade Science Ms. Kindregan. Layout of the Periodic Table. Atomic Number : The number of protons in the nucleus in an atom. Atomic Mass : The average mass of the atoms of an element. Group : the elements in a column of the periodic table - PowerPoint PPT PresentationTRANSCRIPT
Layout of the Periodic Table
Atomic Number: The number of protons in the nucleus in an atom.
Atomic Mass: The average mass of the atoms of an element.
Group: the elements in a column of the periodic table
Period: a horizontal row in the periodic table
Families on the Periodic TableElements on the periodic table can be
grouped into families bases on their chemical properties.
Each family has a specific name to differentiate it from the other families in the periodic table.
Elements in each family react differently with other elements.
How to Read Periodic Table
Atomic Number: Number of protons in the nucleus of the element.
Atomic Mass: average mass of isotopes in this element.
NonMetals Non-metals are the
elements in groups 14-16 of the periodic table.
Non-metals are not able to conduct electricity or heat very well.
As opposed to metals, non-metallic elements are very brittle.
The non-metals can be gases, such as oxygen and solids, such as carbon.
The non-metals have no metallic luster, and do not reflect light.
Alkali Metals
Group 1Hydrogen is not a
member, it is a non-metal1 electron in the outer shellSoft and silvery metalsVery reactive, esp. with
waterConduct electricity
Alkaline Earth MetalsGroup 22 electrons in the
outer shellWhite and
malleableReactive, but less
than Alkali metalsConduct
electricity
Transition MetalsGroups in the
middle
Good conductors of heat and electricity.
Some are used for jewelry.
The transition metals are able to put up to 32 electrons in their second to last shell.
Can bond with many elements in a variety of shapes.
Rare Earth MetalsSome are
RadioactiveThe rare
earths are silver, silvery-white, or gray metals.
Conduct electricity
Noble GasesNoble GasesExist as gasesNon-metals8 electrons in the
outer shell = FullHelium (He) has
only 2 electrons in the outer shell = Full
Not reactive with other elements
Metalloids Metalloid:Metalloids are the
elements found between the boundary that distinguishes metals from non-metals.
Metalloids have properties of both metals and non-metals.
Some of the metalloids, such as silicon and germanium, are semi-conductors.
HalogensHalogens7 electrons in the
outer shellAll are non-
metalsVery reactive
are often bonded with elements from Group 1