Atoms
What is an atom?
An atom is the basic unit of an element
What is a molecule?
Two or more atoms bonded together; A molecule is a more than one atom combined to form a substance
What is an element?
An element is a pure substance composed of one type of atom.
What are the three types of subatomic particles within an atom?
Protons, Neutrons, and Electrons
How many hydrogen molecules are in H2O?
Two
What element has only 1 proton?
Hydrogen
Which subatomic particles (of an atom) have a positive charge, which have a neutral charge, and which have a negative charge?
Neutrons are neutral, protons are positive, and electrons are negative.
Describe how many carbon and oxygen atoms are in this Carbon Dioxide molecule: CO2
One Carbon atom and two oxygen atoms
What does the atomic number tell us? Bonus 50 points if you can say where the number can be found
How many protons the atom has; the number can be found at the top of each element's box
How many elements are there (that we know of)?
There are 118 elements (and therefore 118 types of atoms!)
Describe how many chlorine, carbon, and hydrogen atoms are in this chloromethane molecule: 3CH3Cl
1 chlorine, 3 carbon, 9 hydrogen
How can you figure out how many orbits an element has?
By looking at the number of the horizontal row (the period) the element is in.
How many electrons can be in the first orbit?
Only 2 electrons
Explain what happened in our experiment with the electricity and the pencils in the water?
How can you figure out the number of neutrons in an atom?
Subtract the atomic number (number of protons; number on the top) from the atomic mass (total mass; number on the bottom).