Spell it
Atomic weight
Element number
difficult elements
Elements we use
100
It's number is 78 and it is shiny

Platinum

100

Mercury

200 

100

Plutonium

94

100

Highly radioactive Np 93

Neptunium

100

used for pipes and once for paint

Lead (Pb 82)

200

its number is 84 found in a cereal box ring

Polonium

200

Gold

196

200

Tantalum (Ta)

73

200

Dy 66 used to coat disk drives

Dysprosium

200

Used between double windows for insulation

Argon (Ar) (bonus point if you know the number)

300

It's letter is W and number is 74

Tungsten

300

Holmium

164

300

Boron (B)

5

300

Er 68 used to dope fiber optic cables and amplify the signal

Erbium

300

Fire starters and lightweight race car components

Magnesium (Mg 12)

400

Mg 12

Magnesium

400
Sliver (Ag 47)

107

400

Promethium (Pm)

61

400

Ir 77 Hard to melt, used for spark plugs

Iridium

400

used as a convenient portable neutron source for detection of precious metals and in oil well logging. 

Californium

500
Sc 21
Scandium
500
Phosphorus (P 15)

30

500

Barium (Ba)

56

500

Os 76 makes other metals stronger

Osmium

500

used for cel phones, lap tops and skull plates

Tantalum (Ta 73)

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