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212.2. Chemical periodic table and structure of the atom.

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In which group chemical element Na belongs to (answer must be written in arabic, addition to it A/B subgroup symbol, for example VIIB.)?
Insight in substances microstructure.
Periodic table of chemical elements and atom structure.

Solve tasks to find hidden Geo point coordinates

  1. Physics: Gravitation, friction and deformation.
  2. Chemistry: Chemical periodic table and structure of the atom.
  3. Chemistry: Substances with constant composition. Chemical formula.
  4. Algebra: Rational numbers.
  5. Physics: Spread of sound.
  6. Algebra: Albraic fraction.
  7. Algebra: Absolute and relative mistake of approximation
  8. Algebra: Solution of linear equalities and inequalities.
  9. Chemistry: Atoms un ķīmiskie elementi.
  10. Geometry: Parallelogram, diamond, triangle, right-angled triangle, trapeze area.