Periodic table 5
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Periodic table 5. Isotopes pp 116-119. Review of Atomic Structure. Nucleus Protons have a positive (+1) charge Neutrons have no charge Electrons Electrons have a negative (-1) charge Much smaller mass Located outside the nucleus. Protons.

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Periodic table 5

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Periodic table 5

Periodic table 5

Isotopes

pp 116-119


Review of atomic structure

Review of Atomic Structure

  • Nucleus

    • Protons have a positive (+1) charge

    • Neutrons have no charge

  • Electrons

    • Electrons have a negative (-1) charge

    • Much smaller mass

    • Located outside the nucleus


Protons

Protons

  • When you change the number of protons, you change the element.

  • The atomic number (Z) is the whole number on the periodic table.

  • Hydrogen Z = 1

  • Calcium Z = 20

  • What is the atomic number of Silicon?

  • Oxygen?

  • How many protons does Magnesium have?


Electrons

Electrons

  • A neutral atom has the same number of electrons as protons.

    • Z x (+1) + Z x (-1) = 0

  • When an atom gains or looses electrons, it has a charge. It is called an ion.

    • The monatomic ion forms based on its valence.

    • They want the “easiest” way to have 8 in its outer shell.

  • The valence of Sodium (Na) is 1. What Ion will it form?


Neutrons

Neutrons

  • All atoms of the same element will have the same number of protons. (atomic number, Z)

  • Atoms of the same element may have a different number of neutrons.

  • If you change the number of neutrons, you change the:

    • massnumber of the element

    • The isotope of the element


Vocabulary

Vocabulary

  • Mass Number – the number of protons plus the number of neutrons

  • Isotope – an atom that has the same number of protons but a different number of neutrons


Isotopes of hydrogen

Isotopes of Hydrogen


Isotope symbols

Isotope Symbols


Isotopes of carbon

Isotopes of Carbon


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