atoms Flashcards
where a noble gases located
group 18
what a groups, verticle or horizontal
verticle
are periods verticle or horizontal
horizontal
do noble gases have high or low chemical radioactivity
low chemical reactivity
what’s a characteristic of the electron configuration of noble gases
they have a full outer shell
what are compounds made up of
2 or more different atoms
what did Neils Bohr do
he contributed to the shells on the atomic model
chlorine (Cl) has 17 electrons. How many electrons does Cl -1 have
18
if an atom has -1 to it, does it gain or lose electrons
gains
if an atom has +1 to it, does it gain or lose electrons
loses
Al +3 is a
Cation
what is an atom
the smallest particle of a chemical element that can exist.
what is an element
a substance composed of the same type of atoms
what did JJ Thompson do
Discovered the electron and proposed the plum pudding model
what did Earnest Rutherford do
Discovered the nucleus and that atoms are mostly empty space, with the gold foil experiment
What did Neils Bohr do
Discovered the electrons exist in energy levels (shells) which surround
the nucleus
how do you get the number of protons and electrons
The atomic number
How do you get the number of neutrons
atomic mass - atomic number
what is the difference between molecule and compound
Molecule is 2 of the same element and compound is 2 of different element
