Potassium

K

Atomic # = 19

Mass # = 39

Family = Alkali metal

Calcium

Ca

Atomic # = 20

Mass # = 40

Family = Alkaline earth metal

Scandium

Sc

Atomic # = 21

Mass # = 45

Family = Transition metal

Titanium

Ti

Atomic # = 22

Mass # = 48

Family = Transition metal

Vanadium

V

Atomic # = 23

Mass # = 51

Family = Transition metal

Chromium

Cr

Atomic # = 24

Mass # = 52

Family = Transition metal

Manganese

Mn

Atomic # = 25

Mass # = 55

Family = Transition metal

Iron

Fe

Atomic # = 26

Mass # = 56

Family = Transition metal

Cobalt

Co

Atomic # = 27

Mass # = 59

Family = Transition metal

Nickel

Ni

Atomic # = 28

Mass # = 59

Family = Transition metal

Copper

Cu

Atomic # = 29

Mass # = 64

Family = Transition metal

Zinc

Zn

Atomic # = 30

Mass # = 65

Family = Transition metal

Gallium

Ga

Atomic # = 31

Mass # = 70

Family = Boron Family

Germanium

Ge

Atomic # = 32

Mass # = 73

Family = Carbon Family

Arsenic

As

Atomic # = 33

Mass # = 75

Family = Nitrogen Family

Selenium

Se

Atomic # = 34

Mass # = 79

Family = Oxygen Family

Bromine

Br

Atomic # = 35

Mass # = 80

Family = Halogen

Krypton

Kr

Atomic # = 36

Mass # = 84

Family = Noble Gas