Biology Forums - Study Force

Explain how the number of valence electrons is related to the chemical properties of an atom. Use two specific
  examples in your explanation. What will be an ideal response?

Question 2

List the four elements that account for over 90 of the mass of living organisms and identify an important biological
  function of each element. What will be an ideal response?

Answer to q. 1

Atoms having filled valence shells (e.g., helium and neon) are stable and unreactive; atoms
having unfilled valence shells (e.g., chlorine and sodium) are unstable and reactive.

Answer to q. 2

Some examples from Table 2-1: Oxygen is required for cellular respiration, carbon forms the
backbone of organic molecules, hydrogen is involved in some energy transfers, and nitrogen
is a component of proteins and nucleic acids.

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