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Noble Gas

Yttrium

bromine

Group 2 Period 3

6 electrons

Iodine

0 neutrons

fluorine

Hydrogen

63 protons

Europeum

9 protons

82 electrons

lead

Xenon

Magnesium

45 neutrons

lithium

Nickel

89 amu

Carbon

127 amu

Group 10 Period 4

3 electrons