Fill in the Blanks Ionic BondingOnline version Make sure you have this tutorial pulled up in another window while answering the questions below - https://contrib.pbslearningmedia.org/WGBH/arct15/SimBucket/Simulations/chemthink-ionicbonding/content/index.html by Tara S 1 When two negative ions get close to each other , they . When a positive and a negative ion get close to each other , they . The positive ion will be formed from an atom that has a tendency to electrons and will usually be a . A negative ion will be formed from an atom that has a tendency to electrons and will usually be a . Metals and nonmetals can bond together by forming an bond . atoms have a strong attraction for electrons . A chlorine atom can take electron from a sodium atom . When 2 ions are held together by the between the opposite charges , this is called an bond . Chlorine is a gas made up of atoms found in , and has the formula Cl2 . Sodium exists as a made of atom ( s ) Each chlorine atom in the Cl2 molecule needs sodium atom to react with . Since there is one sodium ion for every chloride ion , the ions are in a : ratio . The formula is then written as . Since there are calcium ions to fluoride ions , this reduces to a 1 : 2 ratio and the formula for calcium fluoride is CaF 2
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