Nickel Ni

Atomic Number: 28
Atomic Mass: 58.693
Half-life: 2.51 hours to 76,000 years

Source:

• Food (chocolate, soybean, nuts, oatmeal)
• Coal combustion
• Nickel mining
• Jewellery

Adverse Effects:

• Allergic reaction
• Chronic bronchitis, reduced lung function
• Lung and nasal/sinus cancer