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Chapter 26, 27

Revise Chemical bonding and Chemical reactions.

What is a compound? A combination of two or more elements bonded chemically.
Why do atoms combine to form compounds? To have a stable (full) outer shell.
What are the two ways that atoms can combine to form compounds? Ionic and Covalent bonding.
What is an ionic bond? Ionic bonding is where one element give away an electron and the other takes it so both have full outer shells.
Why do compounds form ionic bonds? Because both elements are unstable naturally and so come together to balance out.
What groups in the periodic table form ionic bonds together? Group 1 and group 7.
How many electrons does sodium want to lose when it bonds with chlorine? 1
How many electrons does magnesium want to lose when it bonds with oxygen? 2
What is a covalent bonds? A covalent bond is when two elements become joined to share electrons.
Why do compounds form covalent bonds? An element with 4 electrons in its outer shell will bond with another element with 4 electron in its outer shell to share 8 electrons and become stable.
How many electrons does hydrogen want to share when it bonds covalently? Why? 1 because it needs an extra one to gain a full outer shell of 2.
How many electrons does carbon want to share when it bonds covalently? 4 so it fills to 8 up the outer shell.
What are the differences between ionic and covalent substances? Ionic bonds give away an electron and covalent share electrons.
Created by: SC Dave



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