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214.2. Periodic table of chemical elements and atomic structure.

Write the answer!

In which period does chemical element O belong to (answer must be written as a number, e.g. 5.)?
Insight in substances microstructure.
Periodic table of chemical elements and atom structure.

Solve tasks to find hidden Geo point coordinates

  1. Geometry: The Pythagorean Theorem. The practical application of Pythagorean Theorem in everyday life.
  2. Geometry: Diameter, which is perpendicular to chord, properties.
  3. Chemistry: Gas volume calculations
  4. Chemistry: Substances physical properties and transformations.
  5. Algebra: Moda
  6. Geometry: Curve angle value, center angle and indrawn angle.
  7. Geometry: Triangle median properties.
  8. Algebra: Square root extraction
  9. Geometry: Rectangle (S = ab, a, b - edges) and area of the square (S=a^2 , a - edge) formulas
  10. Geometry: Squar, properties and signs.