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. - PowerPoint PPT PresentationTRANSCRIPT
Electron BasicsElectron Basics
Atom ReviewAtom 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
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
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
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 ShellsElectron 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
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
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
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Valence ElectronsValence 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.
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 DiagramsBohr 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.
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.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Bohr Diagram PracticeBohr Diagram Practice
Pick 3 elements from the first 18 elements, and create Bohr Diagrams for those elements.
Pick 3 elements from the first 18 elements, and create Bohr Diagrams for those elements.