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The Chemistry of Life. Section 2.1: The Nature of Matter Teacher: Mrs. Rolle Presenter: Mevan Siriwardane September 27, 2007. Atomic Structure. ELECTRON – negative, mass nearly nothing. NEUTRON – neutral, same mass as proton (“1”). PROTON – positive, same mass as neutron (“1”).

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The chemistry of life

The Chemistry of Life

Section 2.1: The Nature of Matter

Teacher: Mrs. Rolle

Presenter: Mevan Siriwardane

September 27, 2007



Atomic structure1

ELECTRON – negative, mass nearly nothing

NEUTRON – neutral, same mass as proton (“1”)

PROTON – positive, same mass as neutron (“1”)

Atomic Structure


The atom
The Atom

Electron

Nucleus

Shell or Orbit


The atom hydrogen
The Atom Hydrogen

Proton

Electron

Hydrogen has one proton, one electron and NO neutrons


The atom helium
The Atom Helium

Proton

Electron

Neutron

Helium has two electrons, two protons and two neutrons


Mass and atomic number

MASS NUMBER = number of protons + number of neutrons

4

He

SYMBOL

2

PROTON NUMBER = number of protons (obviously)

Mass and atomic number


The atom helium1
The Atom Helium

Proton

Electron

Neutron

Helium has two electrons, two protons and two neutrons


The atom lithium
The Atom Lithium

Electrons

Protons

Neutrons


The atom beryllium
The Atom Beryllium

Electrons

Protons

Neutrons

Beryllium has four electrons, four protons and five neutrons.


The atom boron
The Atom Boron

Electrons

Protons

Neutrons

Boron has five electrons, five protons and six neutrons.


The atom carbon
The Atom Carbon

Electrons

Protons

Neutrons

Carbon has six electrons, six protons and six neutrons.


The atom nitrogen
The Atom Nitrogen

Electrons

Protons

Neutrons

Nitrogen has seven electrons, seven protons and seven neutrons.


The atom oxygen
The Atom Oxygen

Electrons

Protons

Neutrons

Oxygen has eight electrons, eight protons and eight neutrons.


The atom fluorine
The Atom Fluorine

Electrons

Protons

Neutrons

Fluorine has nine electrons, nine protons and ten neutrons.


The atom neon
The Atom Neon

Electrons

Protons

Neutrons

Neon has ten electrons, ten protons and ten neutrons.


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