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Ionic Charges and Naming Unit 2 Notes. Ionic Charges of the Elements Elements in the same group of the periodic table have similar properties. – Example:

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Presentation on theme: "Ionic Charges and Naming Unit 2 Notes. Ionic Charges of the Elements Elements in the same group of the periodic table have similar properties. – Example:"— Presentation transcript:

1 Ionic Charges and Naming Unit 2 Notes

2 Ionic Charges of the Elements Elements in the same group of the periodic table have similar properties. – Example: forming ions with same charge. Alkali metals lose 1 electron, Alkaline Earth metals lose 2 electrons (Al loses 3). Halogens gain 1 electron. O, S, and Se each gain 2 electrons. N and P gain 3 electrons.

3 Metal Ions Refer to table 5.3 (pg. 120) for ions formed by metals. Metals with more than one common ion use roman numerals when naming. – Example: Cu + and Cu 2+ ions are called Copper(I) and Copper(II) ions. The Roman numeral represents the charge of the ion. (remember, subscripts represent how many, not necessarily the charge)

4 In-Class Assignment Pg. 121, example 3 and example 4

5 Polyatomic Ions Tightly bound groups of atoms that behave as a unit and carry a charge. (Table 5.4) Most end in –ite or –ate. – Exceptions = ammonium NH 4 +, cyanide CN -, and hydroxide OH - Generally –ite means one less atom compared to the –ate. – Example: HSO 3 - (Hydrogen sulfite) and HSO 4 - (Hydrogen sulfate)

6 Combining Ions When two ions combine the sums of the charges of each ion determines the overall charge of the polyatomic ion. – Example: H + + CO 3 2- The polyatomic ion is written as HCO 3 - because the one extra proton the Hydrogen ion combined with the two extra electrons of the carbonate ion results in an overall negative charge (1 more electron than protons).

7 Systemic Names Binary Ionic Compounds – Composed of two elements – Electrically neutral Example 5 (together on pg. 126) – Concept practice (do on your own) – Practice problem (do on your own)

8 Naming Binary Ionic Compounds Remember “bi” means 2 This means the binary ionic compounds only involved 2 different ions. (not 2 polyatomic ions) – Example 6 – Concept practice – Practice problem

9 Ternary Ionic Compounds Ternary compounds contain atoms of three different elements. – Example 7 (pg. 129) – Concept practice – Practice problem

10 Binary Molecular Compounds Ionic charges are not used Use prefixes – The names of all binary compounds (both ionic and molecular) end in ide. It is important to know if the elements are nonmetals or metals – Example 9 (pg. 131) – Practice problems 25 & 26 (pg. 132)

11 Naming Acids


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