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Experiment 13 — Build an Atom

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Topic: Chemistry · Class 9 · Structure of the atom: shells, valency and isotopes

Aim: Build a neutral atom of sodium (atomic number 11, mass number 23) and state its valency.

Daily: Why sodium reacts violently with water while neon does nothing at all comes down to a single electron in an outer shell. The whole periodic table is built on this.

Question: An atom has 11 protons and 10 electrons. It is…

Exp: One electron short of balance gives a net positive charge: Na⁺.

Question: The atomic number equals the number of…

Exp: It identifies the element.

Exp: Electrons weigh almost nothing.

Question: Isotopes differ in the number of…

Exp: Same element, different mass.

Question: Neon (2, 8) is unreactive because its outer shell is…

Exp: A complete octet is stable.

All activities in Science Lab - Advance 2

  1. Part 2 — Chemistry
  2. Experiment 1 — Read the Motion Graph
  3. Experiment 2 — Stop Before the Cow
  4. Experiment 3 — Force, Mass and Acceleration
  5. Experiment 4 — The Recoiling Cannon
  6. Experiment 5 — Hammer and Feather
  7. Experiment 6 — Archimedes and the Crown
  8. Experiment 7 — Over the Hill
  9. Experiment 8 — Sound the Ocean Floor
  10. Experiment 9 — From Ice to Steam
  11. Experiment 10 — Solution, Colloid or Suspension?
  12. Experiment 11 — Unmix the Ink
  13. Experiment 12 — Where Did the Mass Go?
  14. Experiment 13 — Build an Atom
  15. Experiment 14 — The Potato Osmoscope
  16. Experiment 15 — Who Does What in the Cell?
  17. Experiment 16 — Name That Tissue
  18. Experiment 17 — Beat the Pests, Keep the Grain
  19. Experiment 18 — Run a Dairy

Practise for Class 9