T4 Atoms and atomic structure

Question 1

the volume of an atom is

Answer 1

mostly unoccupied

Question 2

isotopes have _ atomic masses

Answer 2

different

Question 3

neutron

Answer 3

no charge mass 1 amu

Question 4

Democritus

Answer 4

atoms indivisible

Question 5

John Dalton

Answer 5

cannonball
-atoms indestructible - of matter
-atom same e are same
-no internal structures

Question 6

J.J. Thomson

Answer 6

Plum pudding, cathode ray
-atom has negative electrons
surrounded by positive charge to balance

Question 7

cathode ray

Answer 7

C: beam must composed of negative particles- electrons
the beam of light –> when charged the beam deflected toward the positive plate and repelled by negative

Question 8

Rutherford

Answer 8

empty space, gold foil
-small positive center nucleus
-most is empty space

Question 9

gold foil experiment

Answer 9

fire alpha particles + at gold and screen
straight through->empty space
deflect–>dense center

Question 10

Bohr

Answer 10

electron shell/planetary
-fixed orbits
-gain or lose by jumping
-absorb/release e

Question 11

mass #

Answer 11

protons + nuetrons

Question 12

stability

Answer 12

protons and neutrons

Question 13

schrodinger

Answer 13

wave
-electrons small affect how act

Question 14

average atomic mass

Answer 14

(mass)(abundance)+(mass)(abundance)
-convert abundance to decimal

Question 15

isotope

Answer 15

atoms of same element with SAME # PROTONS and different # of neutrons

Question 16

ion

Answer 16

charged atom

Question 17

gain electron

Answer 17

negative ion (anion)

Question 18

lose electron

Answer 18

positive ion (cation)