atomic theory timeline 2

Question 1

discovered that an atoms contains a nucleus with positively charged particles and that the electrons must be “floating” around the nucleus

Answer 1

ernest rutherford 1909

Question 2

proposed that electron moved around the nucleus in energy levels (shells), but no electrons between the energy level (think ladder)

Answer 2

niels bohr 1913

Question 3

modern atomic theory is made by

Answer 3

erwin shrodinger and werner heisenberg

Question 4

modern atomic theory

Answer 4

electrons have no predictable pattern and move in a region where electrons are likely to be found called the electron cloud

Question 5

if both the proton and the electron have the same number

Answer 5

an atom has no charge

Question 6

if there are more protons than electrons

Answer 6

the atom has a positive ion form (more positive than negatives)

Question 7

if there are mor electrons that protons,

Answer 7

a negative ion is formed (more negatives that positives

Question 8

combinations of atoms

Answer 8

molecules

Question 9

elements

Answer 9

only one type of atom

Question 10

compounds

Answer 10

made up of different types of atoms