What Is The Formula For Potassium Sulfide – A. Cations form when atoms gain electrons B. Cations form when atoms lose electrons.
7 What are electrons in the highest energy level of an atom called?
What Is The Formula For Potassium Sulfide
Gains electrons, gives electrons, does not change the number of electrons, does not follow the octet rule.
Solved] Give The Formulas Of The Following Compounds: Potassium Sulfide:…
Melting point is relatively high Melting point is variable and unpredictable Melting point is relatively low Sodium chloride is insoluble
18 When naming a transition metal ion that may have more than one common ionic charge, the numerical value of the charge is indicated by the prefix suffix roman numeral, name superscript following the name.
19 -ate or -iti at the end of a compound name usually indicates that the compound consists
Cation on left, anion on right Anion on left, cation on right Roman numeral first, then anion, then cation first Subscripts, then ions
Tin (ii) Sulfide Powder
It corresponds to the period number which corresponds to the family/group number like the atomic number like the atomic mass
Name of formula ions NaCl Na+ Cl- sodium chloride K2S K+ S2- potassium sulfide MgO Mg2+ O2- magnesium oxide CaI2 Ca2+ I- calcium iodide Al2O3 Al O2- aluminum oxide
4 What do you do… When you are given a formula, you must determine the correct name When you are given a name, you must determine the correct formula
Solved: Ionic Compounds: Simple Metal + Simple Non Metal Name Cation Anion Formula Potassium Sulfide Magnesium Oxide Lithium Phosphide Aluminum Chloride Ionic Compounds: Transition Metal + Non Metal Name Cation Anion Formula Copper (i)
Elements in groups 1, 2, and fix or set charges when they form ions… you should have marked this in your table (group 1 is +1, etc.. .) but most transition metals (groups 3-12) and Tin ( Sn ) and Lead ( Pb ) form many ions due to variable valence Silver ( Ag ), Cadmium ( Cd ) and Zinc ( Zn ) are the only transition metals that have a fixed charge… You must remember this!!!!! !
6 OUTLINE Silver, Cadmium and Zinc on your desk… write them on your bills… OUTLINE Tin & Lead on your desk
Since most metals in groups 3 through 12 and Sn & Pb have multiple charges when you name them in a compound, you must put a Roman numeral after their name to indicate which ion it is. .. Pb+2 is called lead II .. .Pb. +4 is called Lead IV Remember, Ag, Cd and Zn have only one charge…they don’t need roman numerals in their names.
For groups 3-12, write “Roman numerals required”. Under Sn & Pb, write “Roman numerals required”. Above Ag, Cd and Zn write “does not require Roman numerals”. You can abbreviate the Roman numerals RN…
Calventas Lab Report
Mercury forms two ions Mercury II is just Hg+2 Mercury I…2 Mercury I always pairs in a compound so even though they have a +1 charge because there are two of them you use them like this: Hg2+ 2
Step 1. Identify the cation. Cations are metals. Write the metal ion and its average charge according to the periodic table. If it has a Roman numeral, that’s its charge. Step 2. Identify the anion. Anions are non-metals. Write the ion and its normal charge. Step 3. Balance the bills. Remember compounds are free!!
Write the formula for potassium sulfide. Step 1 Identify the cation and anion. Potassium = K+ Sulfide = S2− STEP 2. Balance the charges. K S2− K+ 2(1+) + 2(1-) = 0 steps K+ and 1 S2− = K2S
A. Copper (I) nitride 1) CuN 2) CuN3 3) Cu3N b. Lead (IV) oxide 1) PbO2 2) PbO 3) Pb2O4
Solved A Solution Contains 0.10 M Sodium Sulfide And 0.10 M
Naming a binary ionic compound 1. Look at the metal a. If it is a Group 1, Group 2 or Group 13 metal, OR Ag, Zn or Cd, just use the name of the metal. b. If it is a TRANSION metal from groups 3-12, or tin (Sn) or lead (Pb) it should be a Roman numeral! 2. A negative non-metallic ion (the secondary ion) is named by changing the end of the element’s name to -ide. Eg: Chlorine becomes Chloride Bromine becomes Bromide
Write the names of the following ions: Ba2+ Al3+ K+ _________ __________ _________ N3 O2 F _________ __________ _______ P3______________
Ba2+ Al3+ K+ barium aluminum potassium N3 O2 F nitride oxide fluoride P3 S2 Cl phosphide sulfide chloride
When naming Cr2O3 or any other compound containing a variable charge metal, always start with the anion. there is a fixed fee. O is always (2-) and there are 3 of them. 3 x (-2) = -6. Therefore, the metal part must have a total charge of +6 to balance the compound 2. Divide the + charge on the metal by the number of metal ions: +6 ÷ 2 = +3 3. Name the cation by the name of the element and use Roman numerals in parentheses to indicate its charge. Cr3+ = chromium(III) 4. Write the name of the anion ending in -ide. Chromium (III) oxide = Cr2O3
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1) Iron sulfide 2) Iron (II) sulfide 3) Iron (III) sulfide B. CuO (Caution! Remember the oxygen charge!) 1) Copper oxide 2) Copper (I) oxide 3) Copper (II) oxide
3) Iron (III) sulfide Fe3+ S2- B. CuO 3) Copper (II) oxide Cu2+ O2- Note: Since Cu and O both have the same charge, the formula reduces to a 1:1 ratio Cu2O2 = CuO
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