1. NAMING COMPOUNDS Naming compounds from their chemical symbol is similar to what you’ve already done – just opposite

2. Ca 3 P 2 CaP 2 i.) separate the two elements ii.) add 1’s with the element that has no number iii.) cross-over from bottom to top iv.) add the charges – REMEMBER that first one (metal) is positive and the second (non-metal) is negative v.) make sure the charges match those found in the Periodic Table *** If they do not, MULTIPLY both charges, with the same number to find their true charge vi.) write the name – the metal stays the same but the non-metal changes it’s ending to “ide” 3 32+- calcium phosph ide

3. AlBr 3 AlBr 3 i.) separate the two elements ii.) add 1’s with the element that has no number iii.) cross-over from bottom to top iv.) add the charges – REMEMBER that first one (metal) is positive and the second (non-metal) is negative v.) make sure the charges match those found in the Periodic Table *** If they do not, MULTIPLY both charges, with the same number to find their true charge vi.) write the name – the metal stays the same but the non-metal changes it’s ending to “ide” 1 13+- aluminum brom ide

4. MgO MgO 1 i.) separate the two elements ii.) add 1’s with the element that has no number iii.) cross-over from bottom to top iv.) add the charges – REMEMBER that first one (metal) is positive and the second (non-metal) is negative v.) make sure the charges match those found in the Periodic Table *** If they do not, MULTIPLY both charges, with the same number to find the non-metals true charge vi.) write the name – the metal stays the same but the non-metal changes it’s ending to “ide” 1 11+- magnesium ox ide ×2 Oxygen should be a -2 ×2 22

5. PRACTICE QUESTIONS LiI Ca 3 N 2 CaBr 2 Al 2 O 3 Ag 2 O BaCl 2 BeS ScP lithium iodide calcium bromide silver oxide beryllium sulfide calcium nitride aluminum oxide barium chloride scandium phosphide

6. LiI i.) separate the two elements Li I ii.) add 1’s with the element that has no number Li 1 I 1 iii.) cross-over from bottom to top Li 1 1 I 1 1 iv.) add the charges – REMEMBER that first one (metal) is positive and the second (non-metal) is negative Li +1 1 I 1 -1 v.) make sure the charges match those found in the Periodic Table *** If they do not, MULTIPLY both charges, with the same number to find their true charge vi.) write the name – the metal stays the same but the non-metal changes it’s ending to “ide” lithium iodide

7. CaBr 2 i.) separate the two elements Ca Br ii.) add 1’s with the element that has no number Ca 1 Br 2 iii.) cross-over from bottom to top Ca 2 1 Br 2 1 iv.) add the charges – REMEMBER that first one (metal) is positive and the second (non-metal) is negative Ca +2 1 Br 2 -1 v.) make sure the charges match those found in the Periodic Table *** If they do not, MULTIPLY both charges, with the same number to find their true charge vi.) write the name – the metal stays the same but the non-metal changes it’s ending to “ide” calcium bromide

8. Ca 3 N 2 i.) separate the two elements Ca N ii.) add 1’s with the element that has no number Ca 3 N 2 iii.) cross-over from bottom to top Ca 2 3 N 2 3 iv.) add the charges – REMEMBER that first one (metal) is positive and the second (non-metal) is negative Ca +2 3 N 2 -3 v.) make sure the charges match those found in the Periodic Table *** If they do not, MULTIPLY both charges, with the same number to find their true charge vi.) write the name – the metal stays the same but the non-metal changes it’s ending to “ide” calcium nitride

9. Al 2 O 3 i.) separate the two elements Al O ii.) add 1’s with the element that has no number Al 2 O 3 iii.) cross-over from bottom to top Al 3 2 O 3 2 iv.) add the charges – REMEMBER that first one (metal) is positive and the second (non-metal) is negative Al +3 2 O 3 -2 v.) make sure the charges match those found in the Periodic Table *** If they do not, MULTIPLY both charges, with the same number to find their true charge vi.) write the name – the metal stays the same but the non-metal changes it’s ending to “ide” aluminum oxide