Structure of an Atom
What is the definition of an atom?
the smallest piece of an element
underneath the chemical symbol
What number is considered neutral on the pH scale?
7
What is the definition of chemistry?
the study of matter
What is the definition of an element?
substances containing only one kind of atom
Who created the periodic table of the elements?
Dmitri Mendeleev
What kind of ions are formed when an acid mixes with water?
hydrogen ions
What is the periodic table of the elements?
a classification system
What is the charge of a proton, electron, and neutron?
proton: positive
electron: negative
neutron: no charge
What is the definition of a period and group on the periodic table?
A period goes across and a group goes down (column)
What kind of ions are formed when a base is mixed with water?
hydroxide ions
How many electrons are located in the inner and outer shells of an atom?
inner: 2
outer: 8
How do you find the number of neutrons in an element?
subtract the atomic number from the atomic mass
When an element has a symbol that doesn't match the way it is spelled, what word are they getting the chemical symbol from?
the Latin word
What is the pH scale used for?
Acids measure from what to what on the pH scale?
0 to 6.9
How many electrons are there compared to the number of protons in an atom?
they are the same
What four things are located on each square of the periodic table?
1. name of element
2. chemical symbol
3. atomic number
4. atomic mass
Bases measure from what to what on the pH scale?
7.1 to 14
What is atomic theory?
based on repeated observations of how atoms act in experiments