Unit 3

Question 1

Explain John Dalton’s atom model

Answer 1

First model of an atom, created in 1803, recognized that atoms of particular elements were different from others. Basically a dot

Question 2

Explain J.J. Thomson’s atomic model

Answer 2

Plum pudding model created in 1904, discovered and recognized electrons as part of atoms

Question 3

Explain Ernest Rutherford’s atomic model

Answer 3

Created in 1911, has positively charged nucleus found by firing alpha particles at a thin sheet of gold foil

Question 4

Explain Niel Bohr’s atomic model

Answer 4

Created in 1913, added electrons orbit and explained the emission spectra of some elements

Question 5

Explain Erwin Schrödinger’s atomic model

Answer 5

Created in 1926, used widely today. Shows electrons move in clouds instead of orbits

Question 6

What elements form covalent bonds?

Answer 6

Nonmetals and nonmetals, have similar electronegativity

Question 7

What elements form ionic bonds?

Answer 7

Metals and nonmetals. Have a large difference in electronegativity