Atomic Numbers
Where is the atomic number located in the element square?
At the top
What makes all of the matter around us?
Atoms
The Periodic Table contains all known _____ in the universe.
Elements
Matter is anything that has _____ and takes up _____.
Mass, Space
What are the three subatomic particles and their charges?
Protons= Positive
Neutrons= Neutral
Electrons= Negative
What does the atomic number tell you about an atom?
The number of protons
What are the electrons in the outer shell called?
Valence Electrons
Who created the Periodic Table?
Dmitri Mendeleev
A pure substance that cannot be broken down into simpler substances is an _____.
Element
What does the Law of Conservation of Matter tell us?
Matter can neither be created nor destroyed, only transferred.
Atomic Mass = # of _____ + # of _____
Protons, Neutrons
What are the two main parts of an atom?
Nucleus and Electron Cloud
What does the period (row) number tell us about an atom?
The number of shells (orbitals) it has
A substance in which two or more different elements are chemically bonded together.
Compound
For an equation to be balanced, both sides of the equation must be _____.
Equal
How do I find the number of neutrons in an atom?
Atomic Mass - Atomic Number
The nucleus of an atoms contains what two subatomic particles?
Protons and Neutrons
What family of elements is Neon in on the Periodic Table?
Noble Gases
Mixtures keep/lose their physical and chemical properties. (Choose one.)
Keep
Where are the Reactants located in a chemical equation and what do they tell us?
They are located on the left and tell us what goes into the reaction.
What is the period number and group number of the element Oxygen?
Period 2, Group 16
Draw the electron configuration for Sodium.
3 shells, 11 protons
List the following for the element Nitrogen.
# of Protons:
# of Neutrons:
# of Electrons:
7, 7, 7
What states that matter cannot be created or destroyed, only transferred?
Law of Conservation of Matter
What is the Golden Rule of balancing equations?
Always change the coefficient, never the subscript