Electron basics
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Electron Basics. Atom Review. Protons and neutrons are bound together to make the atomic nucleus Protons have a positive electrical charge Neutrons are neutral and have no electrical charge. What is an electron?. It is a sub-atomic particle that can be found around the atomic nucleus.

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Electron Basics

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Electron basics

Electron Basics


Atom review

Atom Review

  • Protons and neutrons are bound together to make the atomic nucleus

  • Protons have a positive electrical charge

  • Neutrons are neutral and have no electrical charge


What is an electron

What is an electron?

  • It is a sub-atomic particle that can be found around the atomic nucleus.

  • It has a negative electric charge

  • Its mass is about 2000x less than a proton or neutron


Where is an electron

Where is an electron?

  • Danish physicist Neils Bohr proposed the idea that electrons can be found around the nucleus in different energy levels or shells.

  • One cannot pinpoint the location of an electron, only about where it is in a specific energy level or shell


Electron shells

Electron Shells

  • There are 7 electron shells (How many periods, or rows are on the periodic table?)

  • Each shell can hold a specific number of electrons

    • # of elements in the period = # of electrons that shell can hold

  • Q: How many electrons can the 2nd electron shell hold?

    • A: 8


Electron shell capacity 1st 18 elements

Electron Shell Capacity - 1st 18 elements

  • 1st Shell: 2 e-

  • 2nd Shell: 8 e-

  • 3rd Shell: 8 e-

  • Electrons fill each shell from the inside out. Ex: the 1st shell is filled first


Valence electrons

Valence Electrons

  • Electrons in the outermost shell are called valence electrons.

  • They are involved in chemical bonding and reactions.

  • We will talk much more about these electrons when we talk about chemical reactions in later chapters.


Bohr diagrams

Bohr Diagrams

  • A conceptual model of an atom

  • # of n and # of p are written in the nucleus (center circle)

  • # of e- are filled in each shell until it is full (How many can each shell hold?)

    • Once a shell is full, you add another circle and continue.


Bohr diagram practice

Bohr Diagram Practice

  • Pick 3 elements from the first 18 elements, and create Bohr Diagrams for those elements.


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