(c) Write the formulas for the analogous species of the elements of period 3;

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Identify the elements in period 3 of the periodic table: Sodium (Na), Magnesium (Mg), Aluminum (Al), Silicon (Si), Phosphorus (P), Sulfur (S), Chlorine (Cl), and Argon (Ar).

Understand that 'analogous species' refers to compounds or ions that are similar in structure or function to a given compound or ion.

Consider common analogous species for each element, such as oxides, chlorides, or hydrides.

Write the chemical formulas for the oxides of each element: Na2O, MgO, Al2O3, SiO2, P4O10, SO3, Cl2O7.

Write the chemical formulas for the chlorides of each element: NaCl, MgCl2, AlCl3, SiCl4, PCl5, SCl2, Cl2.

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주요 개념

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Periodicity

Periodicity refers to the recurring trends that are observed in the properties of elements as you move across a period in the periodic table. In period 3, elements exhibit changes in atomic size, ionization energy, and electronegativity, which influence their chemical behavior and the types of compounds they form.

Ionic and Covalent Compounds

Elements in period 3 can form both ionic and covalent compounds. Ionic compounds typically form between metals and nonmetals, where electrons are transferred, while covalent compounds form between nonmetals through the sharing of electrons. Understanding the nature of bonding helps in predicting the formulas of the analogous species.

Oxidation States

Oxidation states indicate the degree of oxidation of an atom in a compound, which is crucial for writing chemical formulas. In period 3, elements can exhibit various oxidation states, influencing the types of ions they form and the resulting chemical formulas of their compounds, such as Na+, Mg2+, Al3+, and Si4+.