Show:
Chemical Bonding
Valence Electrons
Ionic Bonds
Covalent Bonds
Metallic Bonds
100
The joining of atoms can form what?
New substances
100
What are valence electrons?
The electrons in the outermost energy level in an atom.
100
Why are ionic bonds formed?
So that the outermost energy level of electrons are filled.
100
What are covalent bonds?
When atoms share their electrons.
100
How are negative electrons located in a metal(hint: they are free to...)?
They are free to move around.
200
What is a chemical bond?
The joining of atoms to form new substances.
200
What determines if an atom will form bonds?
The number of valence electrons.
200
What are ionic bonds?
When the valence electrons of one atom transfers to another.
200
Name a covalent bond.
Water, oxygen, sugar, etc.
200
How are metallic bonds formed?
When a positively charged metal ion loses its electrons.
300
What happens to electrons when chemical bonds are formed?
Electrons are shared, gained, or lost.
300
Why don't noble gases form bonds?
They have a full outer shell.
300
How are negative ions formed?
When electrons are gained.
300
Covalent bonds tend to have low_______ and _________.
Melting and boiling points.
300
How can copper be rearranged?
Copper can be made into wires for electrical use.
400
What is needed to be known to understand how chemical bonds are formed?
The number of electrons in an atom.
400
How are elements grouped on the periodic table?
They are grouped by similar properties.
400
What does an atom with very few valence electrons usually do to get a full outer shell?
Lose its electrons.
400
What is a molecule?
Two or more atoms joined together.
400
How can metals bend without breaking?
Positive ions are attracted to the electrons, which is able to freely slide around. The electrons maintain the bond with the ion.
500
Why is the atomic number the same as the number of electrons(even though the atomic number represents the protons)?
The protons are positive charge, but atoms should remain neutral(no charge). Electrons cancel out the positive charges.
500
What is an easy way to find the number of valence electrons for groups 13-18 on the periodic table?
You take the group number and subtract the number by 10.
500
How is an Aluminum atom with a 3+ charge written?
AL3+ ("3+" should be in small font)
500
What is one way we represent atoms and molecules?
Using electron-dot diagrams.
500
Name the properties of metals.
Electrical conductivity(able to conduct electric current), malleability (can be shaped into other shapes without breaking), and ductility (able to be made into wires -- like copper -- and thin sheets -- like aluminum)