Classifying Elements

1
Classifying Elements

• Atomic Number
• Symbol
• Atomic Mass

• Periodic Table
• Elements
• Metals
• Nonmetals
• Noble Gases

2
What are symbols?

• One or two letters that represent the name of an
  element.
• All of the symbols have either one or two
  letters.
• The first letter of each symbol is a capital
  letter, and the second letter is a small letter.
• No period is used at the end of a symbol.

3
What is the Periodic Table?
4
Terms to Know

• Isotopes-one of a group of atoms of an element
  with the same number of protons but different
  numbers of neutrons.
• Deuterium-an isotope of hydrogen that has one
  proton and one neutron.
• Tritium-an isotope of hydrogen that has one
  proton and two neutrons.
• Atomic mass-the average mass of all the isotopes
  of a particular element.

5
Continued terms

• Family-a group of elements with similar
  properties,arranged together in a column of the
  periodic table
• Metal-one of a group of elements that is usually
  solid at room temperature, often shiny, and
  carries heat and electricity well.
• Alloy-a mixture of two or more metals.
• Nonmetal-a group of elements with properties
  opposite to those of metals.

6
Metal Facts

• Most metals are solid at room temperature.
• Most metals can be polished to look shiny.
• The shape of a metal can be changed. For example,
  aluminum can be pounded into a thin foil without
  being broken. Copper is often stretched into very
  thin wires.
• Electricity and heat travel well through metals.

7
Nobel Gases

• One of a group of elements made up of gases that
  do not combine with other materials under
  ordinary conditions. Neon is an example of a
  noble gas.
• Inert- a description of an element whose atoms do
  not react in nature with atoms of other elements.