ch 2

Question 1

Who proposed the atomic theory?

Answer 1

John Dalton

Question 2

Who discovered the electon?

Answer 2

Thomson

Question 3

Who measured the electron and measured their charge to mass ratio?

Answer 3

Millikan

Question 4

Who discovered the nuclear theory of the atom?

Answer 4

Rutherford

Question 5

Nuclear theory

Answer 5

the atom is mainly empty space, with most of its mass concentrated in the nucleus and most of its volume occupied by very light electrons

Question 6

Who discovered neutrons?

Answer 6

Chadwick

Question 7

radioactivity

Answer 7

unstable nucleus of atoms

Question 8

atomic mass

Answer 8

neurons + #protons

Question 9

atomic number (Z)

Answer 9

of protons

Question 10

Isotopes

Answer 10

atoms of an element with the same number of protons but different number of neutrons

Question 11

Ions

Answer 11

charged atoms

Question 12

cation

Answer 12

positive ion, lost electron

Question 13

anion

Answer 13

negative ion, gained electron

Question 14

how is the per table arranged?

Answer 14

rows of increasing mass and similar properties

Question 15

in periodic table, the columns are called

Answer 15

groups

Question 16

in the periodic table, the rows are called

Answer 16

periods

Question 17

who arranged the periodic table?

Answer 17

Mendeleev

Question 18

metals

Answer 18

good conductors of heat/electricity, malleability, ductility, shiny, tend to lose electrons

Question 19

non metals

Answer 19

poor conductors of heat/electricity, can be found in any state, tend to gain electrons

Question 20

metalloids

Answer 20

some are semiconductors, mixed properties

Question 21

main-group elements

Answer 21

predictable based on their position in the periodic table

Question 22

transition elements/ metals

Answer 22

less predictable based on the periodic table

Question 23

noble gases

Answer 23

un-reactive, complete, stable filled p orbitals

Question 24

alkali metals

Answer 24

reactive metals

Question 25

alkaline earth metals

Answer 25

fairly reactive

Question 26

halogens

Answer 26

very reactive non-metals

Question 27

more metallic in color..

Answer 27

more likely to lose electrons

Question 28

cation element

Answer 28

“ion”

Question 29

anion element

Answer 29

” –ide ion”

Question 30

molar mass

Answer 30

atomic mass, g/mol

Question 31

mole

Answer 31

number of atoms in a specific element

Question 32

avogadro’s number

Answer 32

1 mol of anything = 6.022 x 10^ 23

Question 33

moles are always related to

Answer 33

mass