Element Group
Atomic Number
#
of
Electrons
#
of
Neutrons
Compounds
100

Calcium

Alkaline Earth Metals

100

Hydrogen

1

100

Carbon

6

100

Helium Neutrons

2

100

CaCO2

Calcium, Carbon, Oxygen

200

Tin

Post-Transition Metals

200

Platinum

78

200

Sulfur

16

200

Aluminum Neutrons

13

200

H2SO4

Hydrogen, Sulfur, Oxygen

300

Cesium

Alkali Metals

300

Xenon

54

300

Radium

88

300

Mercury Neutrons

120

300

C12H22O11

Carbon, Hydrogen, Oxygen

400

Promethium

Lanthanoids 

400

Uranium

92

400

Astatine

85

400

Radium Neutrons

138

400

AgNO3

Silver, Nitrogen, Oxygen

500

Oganesson

Noble Gases

500

Copernicium 

112

500

Tungsten

74

500

Bismuth

125

500

Au3IBr2Cl

Gold, Iodine, Bromine, Chlorine

M
e
n
u