The Periodic Table
There are 90 of these naturally occurring on the Earth
Elements
Allows us to see the arrangement of what part of an atom?
Electrons
What are the two types of chemical bonds that form?
Ionic and covalent
When placed in an aqueous solution these will break into hydrogen ions
Acids
What reacts to form an ionic compound?
Non-metal and metal
Most elements are?
Which electron shell has the lowest energy?
First shell
What happens to the atoms in a covalent bond?
They are shared
When placed in an aqueous solution these will break into hydroxide ions
Bases
What is the chemical formula for sodium and sulfur?
Na2S
What do we use to arrange elements on the Periodic Table?
Atomic number
What are the electrons called that are on the outer shell?
Valence electrons
An atom that loses or gains an electron becomes an?
Ion
The pH scale measures the concentration of this type of ion
Hydrogen ions
What are covalent compounds made from?
Non-metals
What is the name of the horizontal rows on the Periodic Table?
Periods
How do you calculate the number of neutrons?
Mass # - atomic #
How are ionic compounds held together?
Electric force
What do acids do to bases when they react?
Neutralize them
What are the names of metals that only have one ion charge?
Monovalent
What scientist arranged atoms by their atomic mass?
Mendeleev
What group on the Periodic Table have full valence shells?
Noble gases
How many naturally occurring diatomic molecules exist?
7
What range are bases on the pH scale?
8-14
What is the name of the compound Rb2O?
Rubidium Oxide