Most of the elements that make up the human body are found near the top of the periodic table, especially among the lighter, nonmetal elements in periods 1–4 and toward the right side.

Big picture: where they sit on the table

If you look at the main elements in a human body (by mass), they cluster in a few clear zones.

  • Very light, top-left to top-center:
    • Hydrogen (H, period 1, group 1).
  • Top-right / right side nonmetals:
    • Oxygen (O), nitrogen (N), carbon (C), phosphorus (P), sulfur (S) – all in periods 2–3, right side.
  • Left / middle “alkali and alkaline earth” metals:
    • Sodium (Na), potassium (K), magnesium (Mg), calcium (Ca) – mainly periods 3–4 toward the left.
  • A few scattered transition/trace metals:
    • Iron (Fe), zinc (Zn), copper (Cu), manganese (Mn), molybdenum (Mo), cobalt (Co), etc., mostly in the 3d transition block (period 4).

So, the pattern is: lots of light nonmetals up top and to the right, plus some light metals to the left, and only tiny amounts of heavier transition metals and beyond.

Quick HTML table of main body elements and their “zone”

html

<table>
  <thead>
    <tr>
      <th>Element</th>
      <th>Symbol</th>
      <th>Approx. body role / abundance</th>
      <th>Region on periodic table</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Oxygen</td>
      <td>O</td>
      <td>Most abundant by mass (~60%+); in water, biomolecules [web:3][web:5][web:9]</td>
      <td>Top-right nonmetal, period 2</td>
    </tr>
    <tr>
      <td>Carbon</td>
      <td>C</td>
      <td>Backbone of organic molecules (~18% by mass) [web:3][web:9]</td>
      <td>Top-right nonmetal, period 2</td>
    </tr>
    <tr>
      <td>Hydrogen</td>
      <td>H</td>
      <td>In water and most molecules (~10% by mass; ~60% of atoms) [web:3][web:7][web:9]</td>
      <td>Top-left, very first element, period 1</td>
    </tr>
    <tr>
      <td>Nitrogen</td>
      <td>N</td>
      <td>In proteins and nucleic acids (~3% by mass) [web:3][web:9]</td>
      <td>Top-right nonmetal, period 2</td>
    </tr>
    <tr>
      <td>Calcium</td>
      <td>Ca</td>
      <td>Bones and teeth (~1–1.5% by mass) [web:1][web:3][web:9]</td>
      <td>Alkaline earth metal, left side, period 4</td>
    </tr>
    <tr>
      <td>Phosphorus</td>
      <td>P</td>
      <td>Bones, DNA, ATP (~1% by mass) [web:1][web:3]</td>
      <td>Right-side nonmetal, period 3</td>
    </tr>
    <tr>
      <td>Potassium</td>
      <td>K</td>
      <td>Electrolyte, nerve impulses (~0.2–0.3%) [web:1][web:3][web:9]</td>
      <td>Alkali metal, left side, period 4</td>
    </tr>
    <tr>
      <td>Sulfur</td>
      <td>S</td>
      <td>In some amino acids and vitamins (trace %) [web:3]</td>
      <td>Right-side nonmetal, period 3</td>
    </tr>
    <tr>
      <td>Sodium</td>
      <td>Na</td>
      <td>Electrolyte, fluid balance (~0.1–0.2%) [web:1][web:3][web:9]</td>
      <td>Alkali metal, left side, period 3</td>
    </tr>
    <tr>
      <td>Chlorine</td>
      <td>Cl</td>
      <td>Electrolyte (Cl⁻ ions); in body fluids [web:3]</td>
      <td>Right-side nonmetal, period 3</td>
    </tr>
    <tr>
      <td>Magnesium</td>
      <td>Mg</td>
      <td>Cofactor in many enzymes (trace %) [web:3]</td>
      <td>Alkaline earth metal, left side, period 3</td>
    </tr>
    <tr>
      <td>Iron</td>
      <td>Fe</td>
      <td>Hemoglobin, oxygen transport (trace) [web:1][web:3]</td>
      <td>Transition metal block, period 4</td>
    </tr>
    <tr>
      <td>Zinc, Copper, others</td>
      <td>Zn, Cu, etc.</td>
      <td>Enzymes and signaling, tiny trace amounts [web:1][web:3]</td>
      <td>Mainly 3d transition metals, period 4</td>
    </tr>
  </tbody>
</table>

The multiple‑choice style answer

There is an online homework-style question that asks, “Where do the elements in the human body tend to be located on the table?” with choices like “All over the table,” “At the bottom of the table,” and “At the top of the table.”

Given that the major body elements are mostly lighter elements in the upper part of the periodic table, the intended answer is “at the top of the table,” not at the bottom or uniformly all over.

Information gathered from public forums or data available on the internet and portrayed here.