Atoms
Molecules
Elements
Periodic Table
Definitions
100
What is an atom?
Basic building blocks of matter.
100
What are molecules made of?
Two or more atoms
100
What are elements made of?
Atoms.
100
Describe what you can find on the Periodic Table of Elements.
Answers will vary.
100
Define proton.
particle inside the nucleus of an atom that has a positive charge.
200
What is at the center of an atom that holds the protons and neutrons?
Nucleus
200
Write the molecular formula for water.
H2O
200
True or false.
Elements are pure substances.
True.
200
What does the symbol Au stand for?
Gold
200
Define neutron.
Neutral particle inside the nucleus of an atom.
300
What force holds all the parts of an atom together?
The electromagnetic force of attraction between the protons and the electrons.
300
Draw carbon dioxide.
300
True or false.
Each element has specific number of protons in the nucleus.
True.
300
What tells us the number of protons and neutrons?
Atomic Mass
300
Define electron.
Particles surrounding the center of an atom that have a negative charge.
400
Where can you find atoms?
EVERYWHERE!
400
How many hydrogen molecules are in this molecule?
2
400
How many types of atoms are inside an element?
One.
400
What is the symbol for potassium?
K
400
Define atomic number.
Number of protons in an atom's nucleus.
500
Which component of an atom has negative charge?
Electron.
500
Name an everyday substance that is a molecule.
answers may vary. (salt, baking soda)
500
What element is found in every living thing?
Carbon
500
How many elements are on the Periodic Table?
112
500
Define element.
substance with atoms that are alike.