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What is the difference between a mixture and a chemical change?
In a chemical change, new substances are formed
Describe the bonds find in a water molecule
One oxygen atom forming two covalent bonds with two oxygen atoms
What is a giant covalent structure
Three dimensional structure of atoms made by covalent bonds
What do elements in the same column of a periodic table have in common
They have the same number of valence electrons
Where non-metals located in the periodic table?
Right side, last-three columns
Why do non-metals tend to form covalent bonds?
They have similiar electronnegativities, neither is strong enough to attract electrons from the other
What is a covalent bond?
Two non metals share their electrons
Explain the ionic bond
Bond formed between ions of opposite charges (usually metal and non-metal)
Why do atoms form bonds?
To gain a stable arrangement of electrons
How many electrons fit into the first, second, and third electron shells?
2,8,18
What is the difference between cation ana anion?
Loss of electrons = cation, gaining of electrons = anion
What is the difference between atomic number and mass number?
Atomic number = how many protons an element has, mass number = neutrons + protons


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