Article: Most elements in the "d-block" of the periodic table (groups 3 through 12) are considered transition metals. Unlike other elements, they can form more than one type of ion. When a transition metal is part of an ionic compound, a Roman numeral is included to specify which ion is involved. For example, copper sometimes forms an ion with a charge of +1, and sometimes with a charge of +2. Copper (I) chloride and copper (II) chloride are 2 different ionic compounds. The Roman numeral tells you which copper ion is part of the compound. The first word of the compound name represents the metal ion, or cation. This is always positively charged. Just add the Roman numeral as a positive charge to the element name: For example, copper (II) chloride includes the cation Cu2+{\displaystyle Cu^{2+}}, since II is the Roman numeral for 2. The second word of the compound name represent the anion. This is the negatively charged ions that form from non-metallic elements. Each element of this type only forms 1 ion. To find the charge of that ion, look it up in a textbook or chemistry website, or memorize the group rules. For example, chloride is the name for a chlorine ion. Chlorine, like similar group 17 elements, forms ions with a charge of negative one. This is written as Cl{\displaystyle Cl^{-}}. This process is the same as for any ionic compound. The total positive charge from the cations always balances out the total negative charge from the anions. The net charge of the ionic compound is always zero. To balance out the 2+ charge from a Cu2+{\displaystyle Cu^{2+}} ion, you need 2 Cl{\displaystyle Cl^{-}} ions (2 ions x -1 charge per ion = -2). This makes an ionic compound with a net charge of +2 -2 = 0. As always, the number of atoms is written as a subscript after the element name. You do not need to write the charges in the final formula: Copper (II) chloride has one copper atom and two chlorine atoms. The formula is CuCl2{\displaystyle CuCl_{2}}.
Question: What is a summary of what this article is about?
Find the Roman numeral in the compound name. Find the charge of the cation. Find the charge of the anion. Balance the charges. Write the chemical formula.

Problem: Article: In order to make your mosaic, you must have a flat, smooth, waterproof surface to work on. Run a piece of sandpaper back and forth all over the surface of the stump to flatten any sharp edges. Then, coat the surface of the stump with a waterproof sealer to keep the stump from absorbing moisture and expanding and contracting as a result. You want to prevent this because it can cause your mosaic to crack. Use a pencil to draw the image that you're planning to create onto the surface of the stump. This can be anything from your initials to a picture of a sun and moon. Drafting the image beforehand may help to keep you from making a mistake as you make the mosaic. Hold a pair of wheeled tile nippers in your hand and pick up a tile. Place the tile between the 2 wheels with the grooved side facing up and then use both of your hands to squeeze the handle and break the tile. Continue doing this to all of the tiles that you plan to use in your mosaic. You can get mosaic tiles and wheeled tile nippers from your local arts and crafts supply store. Squirt a small dab of wood glue onto the surface of the stump and spread it thin with a spoon if necessary. Then, quickly place a couple pieces of broken tile onto the glue with the grooved side facing down. Press down for several seconds. Repeat this process while creating your entire mosaic. Once you've glued down all of your tiles, let the glue dry for 24 hours. Then, scoop some sand-less grout onto a flexible spatula and apply the grout to the entire surface of your mosaic. Wipe it smooth with the spatula so that the application is desirably even. Let the mosaic dry completely. After about 24 hours, the grout should be dry. At this point, you'll need to clean the grout off of the tiles. Spray white vinegar onto your mosaic. Then, wipe the surface of the tiles clean with a cloth.
Summary: Sand and seal the surface of the stump. Draft your design in pencil. Crack your tiles into pieces. Squirt wood glue onto the stump surface and push down a tile piece. Use a spatula to apply grout to the surface of the mosaic. Clean off the tiles with white vinegar.

Pull your hand slightly back as you throw. Use your hand, wrist, and elbow for speed. Keep your shoulder still for support. Place more weight on your front foot as you throw the dart. Do not lean or sway to the side. Keep your body still and straight. Only your arm should be moving when you throw the dart. Your elbow may raise up slightly when you throw the dart. This is okay, as it may move upward due to the force of your throw. Let your wrist snap forward as you release the dart. Make sure your wrist does not snap downward, as this will cause the dart to fly downward. The wrist snap is often done by professional players to increase the acceleration of the dart. It can also result in a more accurate and consistent throw. Once you have released the dart, let your arm continue in a throwing motion so your fingers are pointing towards your target, or down at the floor. Allow your arm to hover in the air for a moment before you drop it down. This will help you maintain good form at the end of your throw.
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One-sentence summary --
Throw the dart with your hand and wrist. Snap your wrist as you release the dart. Follow through at the end of the throw.