Which element with atomic number 28 is silvery-white and resistant to corrosion?

• A. Copper
• B. Nickel
• C. Iron
• D. Zinc

Answer: (B)

Nickel, the element with atomic number 28, is silvery-white and highly resistant to corrosion because it forms a stable, protective oxide layer on its surface. That thin coating acts as a barrier, slowing or stopping further reaction with air and moisture, a phenomenon known as passivation. This makes nickel stay bright and durable in many environments, which is why it’s valued for coatings and stainless steel.

Copper, in contrast, develops a color change and patina over time due to oxidation; iron readily rusts when exposed to moisture; zinc is more reactive and often used to protect other metals, but it doesn’t maintain nickel’s level of corrosion resistance in the same contexts.