chapter 4.2

Question 1

who named atoms

Answer 1

democritus

Question 2

who developed atomic theory (tiny particles)

Answer 2

dalton

Question 3

opposite charges…

Answer 3

attract

Question 4

in the cathode ray experiment, the particles in the beam had which charge

Answer 4

negative e-

Question 5

what is the charge of an atom

Answer 5

neutral

Question 6

what was JJ thomson’s model?

Answer 6

plum pudding

Question 7

who discovered alpha particles and protons

Answer 7

Ernest rutherford

Question 8

what is an alpha particle

Answer 8

fast-moving positively charged particles

Question 9

who discovered the neutron

Answer 9

james chadwick

Question 10

who discovered the electron

Answer 10

thomson

Question 11

what is atomic number? what does it also equal?

Answer 11

number of protons in an atom; electrons

Question 12

mass number

Answer 12

number of protons and neutrons in the nucleus

Question 13

equation to find number of neutrons?

Answer 13

mass number - atomic number

Question 14

isotopes have the same number of _________ but a different number of ________

Answer 14

same atoms; different mass

Question 15

what happens when atoms absorb energy?

Answer 15

an increase in kinetic energy, phase change, and energy is absorbed

Question 16

what causes e- to move to a higher/lower energy level?

Answer 16

when the atom gains/loses energy

Question 17

what is an electron cloud

Answer 17

visual model of the most likely locations for electrons in an atom

Question 18

what is an orbital

Answer 18

a region of space around the nucleus where an electron is likely to be found

Question 19

what is ground state

Answer 19

a state in which all the electrons in an atom have the lowest possible energies

Question 20

what are all the same number in subatomic particles?

Answer 20

proneutonic number