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T/F covalent compounds are between nonmetal and nonmetal
True
T/F covalent compounds form small molecules and have low melting points
T
name three non metals
named
which two non metals form large covalent lattice structures?
carbon (diamond) silicon (sand)
Which compounds tend to form large crystal lattices? ionic or covalent?
ionic
true or false Ionic compounds have high melting points
true
Aluminium oxide (AlO) covalent or ionic
ionic
salt (NaCl) ionic or covalent?
ionic
carbon dioxide (CO2) covalent or ionic
covalent
water (H2O) is a covalent compound or ionic compound
covalent
Atoms that have an electric charge due to gain or loss of electrons are called _______
ions
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 and 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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