Bellringer

1
Bellringer

• Read page 510 then answer the following
  questions
• What significant changes occurred in the atomic
  model between Figure 5A and Figure 5B?
• What significant changes occurred in the atomic
  model between Figure 5B and Figure 5C?
• What significant changes occurred in the atomic
  model between Figure 5C and Figure 5D?

2
Structure of the Atom
3
Scientific Shorthand

• C
• Al
• N
• O
• CO2
• H2O
• All of these are symbols for an element or a
  compound
• It is easier to write C rather than Carbon or H2O
  rather than Dihydrogen Oxide

4
Atomic Components

• Element matter that is composed of one type of
  atom
• Atom smallest piece of matter that still
  retains the property of the element
• Atoms are composed of
• Protons
• Neutrons
• electrons

5
Inside the Nucleus

• Atoms contain a center positively charged that is
  composed of neutrons and protons
• Protons particles with an electrical charge of
  1
• Neutrons neutral particles that do not have an
  electrical charge

6
Outside the Nucleus

• Outside the nucleus is a cloud of particles
  called electrons
• Electrons particles with an electrical charge
  of -1

7
Atoms

• Atoms of different elements differ in the number
  of protons they contain
• (They usually differ in electrons and neutrons
  as well)

8
Electron Cloud

• Many models for the atom have been attempted, but
  by 1926 scientist developed the electron cloud
  model that we use today.
• Electron cloud is the area around the nucleus
  of an atom where its electrons are most likely
  found
• This area is 100,000 times larger than the
  diameter of the nucleus