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Chemistry Extended Learning Lesson 3
Transcript of Chemistry Extended Learning Lesson 3
What is the octet rule?
Rather than giving away or accepting electrons, some atoms share their outer electrons to achieve full outer shells.
Covalent boding is where two or more non-metal atoms share pairs of valence electrons. Covalent bonding may be single or multiple, depending on the number of pairs the atoms share.
What kind of bond is the compound CH4 held together by?
Covalent bonds are formed from pairs of electrons, one from each atom. The pair is included in the outer shell of both atoms at once.
This allows both atoms have a full set of 8 electrons in their outer shell and become stable. No electrons leave their original atoms -- so the atoms always remain neutral.
Science Extended Learning
What are cations and anions?
What are ionic bonds?
Needs 2 electrons
Needs 1 electron
Shares their electrons to become stable.
Ionic and Covalent Bonds
What are valence electrons?
List 2 compounds that have
a) An Ionic bond
b) A covalent single bond
c) A Covalent double bond
What are some differences between ionic and covalent bonds?
Draw the ionic structure of Argon gas and explain why its structure is stable.
6 valence electrons
shares 2 electrons
Qs 1-13 & 17
Qs 2-5, 7 & 8
Pg. 170 1-7,12, 13 & 15