90. Solving a chemistry problem

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4.1) Give characteristics to chemical elements with serial numbers 12, 13, 19 according to their position in D. I. Mendeleev's PSCE in accordance with the following plan:

• Indicate the serial number of the element, the number of the period, series, group, indicate the subgroup of this element; is a metal or non-metal.
• Indicate the charge of the nucleus of a chemical element; the number of protons, electrons, neutrons; distribution of electrons by levels.
• Compose the electronic formula of the element.
• Indicate the number of electrons in the external energy level, the level is completed or not completed.
• The highest valency of the element.
• Higher oxide and volatile hydrogen compound (if any).
• Comparison of element activity with neighbors by period and by subgroup.
• Which base or which acid corresponds to the highest oxide of this element.
• Give examples of formulas of salts formed by this element, give them a name.
• The presence of isotopes.

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