notes gb lab 10 names bond ionic bond 01
Post on 27-Jun-2015
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Notes
The student will:Accurately identify the characteristics of an Ionic Bond and a Covalent Bond
Demonstrate what causes a chemical bond
Valence ElectronIonic BondCovalent Bond
The electrons located on the outer energy level of each element.
The Number of valence electrons ranges from 1 – 8▪Atoms with 1 – 7 valence electrons are unstable and require bonding to make them complete▪Atoms with 8 valence electrons, The Noble Gases, are stable and therefore do not bond with any other elements.
A chemical bond between a metal and a nonmetal. It is when valence electrons are borrowed/taken from the metal to bring the outer energy electron level of the nonmetal up to 8
The metal “Donates” electrons to the non-metal
Metals donate, loan (lose) electrons while nonmetals borrow (gain) electronsEach metal loses electrons becoming a Positive (+) Ion
Each nonmetal gains electrons becoming a Negative (-) Ion
Have a high conductivity reading > 700 Micro-Siemens
Easily broken
A bond between two like atoms or a nonmetal and another nonmetal▪ The outer energy
level electrons are shared between the two atoms to make the valence complete at 8.
Are a very strong bond▪Are found in solid, liquid and gas form▪Bond like a chain link▪Low conductivity < 500 micro-Siemens
Most atoms by themselves are unstable All but group 18, The Noble Gases
They seek to complete their outer energy level to become stable
Low valence numbers (metals) lose electrons
High valence numbers (nonmetals) gain electrons
To become stable, atoms need to bond with other atomsMetals w/ NonmetalsNonmetals w/ NonmetalsSame atom w/ same atom
There are two types of chemical bonds▪Ionic Bond ▪Covalent Bond
Ionic Bond ▪Metals with nonmetals▪Na(1) + Cl(7) = NaCl(8) (valence numbers in parentheses)
Covalent Bond ▪Nonmetals w/ nonmetals▪Example:H(1) + H(1) + O(1) H2O (3)
(valence numbers in parentheses)
We can test for bond type by testing the conductivity of a chemical compound solutionThe chemicals in waterBy measuring Conductivity in Micro-Siemens
Remember:Bonding takes place to give atoms stability
Bonding allows for compounds to form
Remember:Atoms bonding with like atoms and nonmetals w/ nonmetals form Covalent Bonds
Remember:Metals bonding with non- metals form Ionic Bonds
Whew!Have a great day!
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