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Atoms

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What is an Atom? The smallest particle from which all element are made. Nucleus: ... Protons and Neutrons make up nearly all the mass of an atom. ... – PowerPoint PPT presentation

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Title: Atoms


1
Atoms
  • Chapter 4 Section 1

2
MODERN Atomic Model
  • What is an Atom?
  • The smallest particle from which all element are
    made.
  • Nucleus
  • The core of the atom that contains two different
    subatomic particles Protons and Neutrons
  • Protons
  • Positively charged particles n an atoms nucleus
  • Neutrons
  • Neutrally charged particles in an atoms nucleus
  • Electrons
  • Negatively charged particles in a cloud-like
    region that surrounds the nucleus of the atom.

3
The Bohr ModelShows the nucleus with electron
orbits surrounding. Electrons have specific
energy levels.
Neutrons have not been discovered at this point!
4
Energy Levels Electrons of different energy
levels are located at different locations around
nucleus
  • Level 1 Holds up to 2 electrons
  • Level 2 Holds up to 8 electrons
  • Level 3 Holds up to 8 electrons

5
Modern Atomic ModelNucleus surrounded by an
Electron Cloud
Notice Neutrons have now been added. They are
found in the nucleus with the protons!
6
Brain Break!
  • Stand up lets play Simon says!

7
Atomic Number
  • Every atom of a given element has the same number
    of protons.
  • Atomic Number the number of protons in the
    nucleus of an atom.
  • Atoms with different atomic numbers are atoms of
    different elements.

8
Calculating the Number of Electrons
  • The of Electrons The of Protons.
  • Atomic Number Protons, and therefore,
    Electrons

7 electrons
7 protons
9
Mass Number
  • Protons and Neutrons make up nearly all the mass
    of an atom.
  • Protons and Neutrons are about equal in mass.
  • Mass Number the sum of the protons and neutrons
    in an atom.

Particle Symbol Charge Relative Mass
Proton p 1 1
Neutron n 0 1
Electron e- 1- 1/1,836
10
Calculating the Number of Neutrons
  • Atomic Number Atomic Mass of Neutrons

This element is Nitrogen. Its mass is 14. So
atomic of 7, minus atomic mass of 14, equals 7
neutrons.
11
What is the Atomic Number?Why is the Mass Number
12?
12
Isotopes
  • Atoms of the same element that have different
    numbers of neutrons.
  • Do you think Isotopes of the same element have
    different mass numbers?
  • Do they have different atomic numbers?

13
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