Which of the following does not contain phosphorus ?
Correct answer: D. Steel
- A. Yolk of egg
- B. Bone
- C. Nerves
- D. Steel
Explanation
Steel is mainly an alloy of iron and carbon and does not normally contain phosphorus as an essential constituent, whereas phosphorus occurs in phospholipids of yolk and nerves and in calcium phosphate of bone. Bone is the likely wrong choice because its rigid mineral composition may be overlooked, but calcium phosphate supplies phosphorus.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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