Module 2

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define valence

is the same as the number of electrons that will be taken to form anions or the number of electrons which will be given away to form cations.
what is the outer shell of electrons called

valence shell
define covalent bond

bond formed between two or more atoms that share electrons
because atoms "want" to gain or shed electrons to fill outer shells, valence also describes how many

positions one moves on the periodic table to reach a noble gas column
define a double covalent bond

when two electrons are shared equally
Triple covalent bond is when

three electrons are shared from each atom
define a polar covalent bond

This kind of bond means that the atoms have a partial charge on them, so it has poles and it's called polar. Because this kind of bond has characteristics of a polar bond and a covalent bond... polar covalent bond
define ionic bond

when atoms hang out together because they have opposite charges.
What atoms are in the human body that form polar covalent bonds
- Oxygen
- Nitrogen
- Sulfur
Ionic bonds are formed between

metal and non-metal ions
In a polar covalent bond the pull on electrons is measured in a quality called

electronegativity
define hydrogen bonds

are a special characteristic of compounds that contain hydrogen and oxygen, hydrogen and nitrogen, and hydrogen and sulfur
define a dipole

more positive charges at one end, more negative charges at the other
what are the most common "electron thieves"
- Oxygen
- nitrogen
- sulfur
electronegative atoms form

dipoles
dipoles attract

opposite charges
Hydrogen atoms usually _______ electrons

lose
Bond strengths...... strongest to weakest
- Covalent
- triple
- double
- single
- Ionic
- Hydrogen

Author

faulkner116

172843

Card Set

Module 2

Description

terms

Updated

2012-12-10T22:11:56Z

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