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100
The atomic number is based on the number of what
What is protons
100
What do we call the study of matter
What is Chemistry
100
What is the smallest piece of an element that can be recognized as that element called
What is atom
100
What are the 3 basic parts of an atom-
What is protons, neutrons and electrons
100
Molecules that are formed from two or more different elements
What is compounds
200
The vertical columns in the periodic table are called this
What is groups
200
The atomic mass is the number of
What is protons and neutrons
200
If an element has 47 protons, how many electrons does it have
What is 47
200
we call elements that possess similar characteristics and react similarly with other elements this
What is categories
200
The horizontal rows in the periodic table are called this
What is periods
300
The number of Hydrogen atoms in this compound H2CO3
What is two
300
What do we call a substance that contains only one kind of atom?
What is elements
300
What do we call strong acids that can burn the skin?
What is corrosive
300
What do we call the substance that changes color when exposed to acid or base solutions?  
What is indicators
300
What is it called when an atom has gained or lost electrons?
What is ion
400
This is a result of positively and negatively charged ions attract each other, resulting in a new compound-
What is ionic bonding
400
Chemical symbols and numbers used to abbreviate the name of a compound-
What is Chemical formula
400
Atoms joined together are called this-
What is molecules
400
The sum of the number of protons and neutrons gives the atom’s approximate-atomic weight
What is atomic weight
400
What is it called when atoms share electrons?
What is Covalent bonding
500
Process where atoms join together to form new substances-
What is chemical reaction or chemical change
500
n this chemical reaction a complex compound breaks into two or more simpler compounds-
What is decomposition
500
Who developed the periodic table of elements?
What is Mendeleev
500
n this chemical reaction a new substance forms when molecules combine-
What is synthesis
500
Who developed a simpler model of an atom?
What is Bohr