Common Elements Atomic Number and Atomic Mass
Families of Elements
Group 1 : Alkali metals Group 2 : Alkaline earth metals Group 17: Halogens Group 18: Noble Gases
Representative Elements
Groups 1, 2, 13, 14, 15, 16, 17, and 18
Transition Metals
Groups 3, 4, 5, 6, 7, 8, 9, 10, and 11 also group 12 except copernicium in group 12 is not a transition metal Lanthanides and actinides are not transition metals
Periods 6 and 7
Lanthanides are considered part of period 6 and actinides are considered part of period 7.
What is the number of elements in each period?
Period 1: 2 elements Period 2: 8 elements Period 3: 8 elements Period 4: 18 elements Period 5: 18 elements Period 6: 32 elements Period 7: is incomplete
Neon (Ne)
atomic number 10 atomic mass 20.18
Sodium (Na)
atomic number 11 atomic mass 22.99
magnesium (Mg)
atomic number 12 atomic mass 24.30
Aluminum (Al)
atomic number 13 atomic mass 26.98
Silicon (Si)
atomic number 14 atomic mass 28.09
Phosphorus (P)
atomic number 15 atomic mass 30.97
Sulfur (S)
atomic number 16 atomic mass 32.06
Chlorine (Cl)
atomic number 17 atomic mass 35.45
Argon (Ar)
atomic number 18 atomic mass 39.95
Potassium (K)
atomic number 19 atomic mass 39.10
Calcium (Ca)
atomic number 20 atomic mass 40.08
Titanium (Ti)
atomic number 22 atomic mass 47.87
Chromium
atomic number 24 atomic mass 52
Manganese (Mn)
atomic number 25 atomic mass 54.94
Nickel (Ni)
atomic number 28 atomic mass 58.69
Copper (Cu)
atomic number 29 atomic mass 63.55
Lithium (Li)
atomic number 3 atomic mass 6.94 or about 7
Zinc (Zn)
atomic number 30 atomic mass 65.38
Arsenic (As)
atomic number 33 atomic mass 74.92
Selenium (Se)
atomic number 34 atomic mass 78.97
Bromine (Br)
atomic number 35 atomic mass 79.90
Strontium (Sr)
atomic number 38 atomic mass 87.62
Beryllium (Be)
atomic number 4 atomic mass 9.01
Silver (Ag)
atomic number 47 atomic mass 107.87
Boron (B)
atomic number 5 atomic mass 10.81
Tin (Sn)
atomic number 50 atomic mass 118.71
Xenon (Xe)
atomic number 54 atomic mass 131.29
Barium (Ba)
atomic number 56 atomic mass 137.33
Carbon (C)
atomic number 6 atomic mass 12.01
Nitrogen (N)
atomic number 7 atomic mass 14.01
Tungsten (W)
atomic number 74 atomic mass 183.84
Platinum (Pt)
atomic number 78 atomic mass 195.08
Oxygen (O)
atomic number 8 atomic mass 16
Mercury (Hg)
atomic number 80 atomic mass 200.59 or 200.6
Radon (Rn)
atomic number 86 atomic mass 222
Radium
atomic number 88 atomic mass 226
Fluorine (F)
atomic number 9 atomic mass 19
Hydrogen (H)
atomic number: 1 Atomic mass: 1.008 or 1.01
Helium (He)
atomic number: 2 atomic mass: 4
Iron (Fe)
atomic number: 26 Atomic mass: 55.85
Germanium (Ge)
atomic number: 32 atomic mass: 72.63
Iodine (I)
atomic number: 53 atomic mass: 126.90
Gold (Au)
atomic number: 79 atomic mass: 196.97
Lead (Pb)
atomic number: 82 atomic mass: 207.2
Inner transition Metals (aka Rare Earth Elements)
lanthanide series and actinide series
Period 1
the s sub-shell has 2 elements
Period 2
the s sub-shell has 2 elements, the p subshell has 6 elements
Period 4
the s subshell has 2 elements, the d subshell has 10 elements, the p subshell has 6 elements
Period 5
the s subshell has 2 elements, the d subshell has 10 elements, the p subshell has 6 elements
Period 6
the s subshell has 2 elements, the f subshell has 14 elements , the d subshell has 10 elements, the p subshell has 6 elements
Period 3
the s subshell has 2 elements, the p subshell has 6 elements