Part 1

The structure of an atom and questions that relate to it

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  • Created by: Alex
  • Created on: 06-09-11 11:48

Atomic Structure

  • Protons and neutrons make up the nucleus of an atom, whilst electrons orbit it
  • Protons:    Relative mass-1.0         charge- 1+
    Neutrons: Relative mass-1.0         charge- 0
    Electrons: Relative mass-1/2000  charge- 1-
  • The number of protons are equal to the number of electrons in an atom

   A                  <---- Mass number 

  X      <---- Element

  Z                    <----- Atomic number

  • Mass number- The number of protons and neutrons in the nucleus of an atom
  • Atomic number- the number of protons in the nucleus of an atom
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Atomic Structure Questions

  • What makes up the nucleus of an atom?
  • Fill in the missing blanks:

Protons:     Rel. Mass--                Charge--
Neutrons:   Rel. Mass--                Charge--
Electrons:  Rel. Mass--                Charge--

  • What is the atomic number of an atom?
  • Define the word mass number.
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Isotopes

  • Isotopes- Are atoms of the same element but with a different number of neutrons in the atoms nucleus
  • isotopes of an element have different masses due to there being a different number of neutrons
  • Isotopes of the same element react in the same way because reactions involve electrons not neutrons
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Isotope Questions

  • What is an isotope?
  • Why does an atom of carbon-12 have a different mass to that of carbon-14?
  • When experimenting with the two isotopes, we had discovered that both isotopes reacted in the same way, explain why this had happened?
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Ions

  • Ion- An ion is a positively charged or negatively charged atom or group of atoms
  • Atoms can lose or gain electrons
  • Ions are charged because they have a different number of electrons that protons in the atom
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Ion Questions

  • Define the word Ion
  • Why are ions charged?
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