https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:measurement-of-matter/x345505a97fc4a662:compound-formation/v/introduction-to-ions-dubv 2025-05-29T08:44:44.739717086Z Introduction to ions An atom with an electric charge is called an ion. A positively charged ion (a cation) has more protons than electrons. A negatively charged ion (an anion) has more electrons than protons. Dubverse video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Introduction to ions An atom with an electric charge is called an ion. A positively charged ion (a cation) has more protons than electrons. A negatively charged ion (an anion) has more electrons than protons. https://cdn.kastatic.org/ka-youtube-converted/ByKVkM6GkbU.mp4/ByKVkM6GkbU.mp4 397 Molecules and ions https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:measurement-of-matter/x345505a97fc4a662:compound-formation/v/naming-ions-and-ionic-compounds-dubv 2025-05-29T08:44:44.739717086Z Naming ions and ionic compounds Ionic compounds are neutral compounds made up of positively charged ions called cations and negatively charged ions called anions. For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion. Let's learn all about naming ions and ionic compounds in this video. Dubverse video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Naming ions and ionic compounds Ionic compounds are neutral compounds made up of positively charged ions called cations and negatively charged ions called anions. For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion. Let's learn all about naming ions and ionic compounds in this video. https://cdn.kastatic.org/ka-youtube-converted/gpVNG8ckEDY.mp4/gpVNG8ckEDY.mp4 237 Molecules and ions https://www.khanacademy.org/science/class-9-chemistry/x46dd29ce84a663ea:atoms-and-molecules/x46dd29ce84a663ea:molecules-and-ions/a/paul-article-2 2021-04-29T08:00:35Z Molecules and compounds Compounds can be classified as ionic or covalent. Molecules are the simplest unit of a covalent compound, and molecules can be represented in many different ways.  article https://www.khanacademy.org/science/class-9-chemistry/x46dd29ce84a663ea:atoms-and-molecules/x46dd29ce84a663ea:molecules-and-ions/a/naming-monatomic-ions-and-ionic-compounds 2021-04-29T07:59:16Z Naming monatomic ions and ionic compounds Learn how to name monatomic ions and ionic compounds containing monatomic ions, predict charges for monatomic ions, and understand formulas.  article https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:measurement-of-matter/x345505a97fc4a662:compound-formation/v/common-polyatomic-ions-dubv 2025-05-29T08:44:44.739717086Z Common polyatomic ions Let's review the common polyatomic ions, and look at the common suffixes and prefixes to help remember the formulas. Dubverse video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Common polyatomic ions Let's review the common polyatomic ions, and look at the common suffixes and prefixes to help remember the formulas. https://cdn.kastatic.org/ka-youtube-converted/pLenBpFM_BU.mp4/pLenBpFM_BU.mp4 349 Molecules and ions https://www.khanacademy.org/science/strengthened-shs-chemistry-1/x174677b2bfa4bea2:measurements-in-chemistry/x174677b2bfa4bea2:naming-compounds/v/naming-ionic-compounds-with-polyvalent-ions 2025-05-29T08:44:44.739717086Z Naming ionic compounds with polyvalent ions Let's understand naming of ionic compounds that contain polyvalent ions, using the example of cobalt (III) sulfide. Dubverse video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Naming ionic compounds with polyvalent ions Let's understand naming of ionic compounds that contain polyvalent ions, using the example of cobalt (III) sulfide. https://cdn.kastatic.org/ka-youtube-converted/GgxjXsf02rQ.mp4/GgxjXsf02rQ.mp4 242 Molecules and ions https://www.khanacademy.org/science/bridge-course-class-11th-chemistry/x426c9d2c554669cb:basic-concepts-of-chemistry/x426c9d2c554669cb:ionic-compounds/e/naming-ionic-compounds 2026-03-29T17:54:23.483136198Z Naming ionic compounds Practice naming ionic compounds when given the formula Yuki exercise https://www.khanacademy.org/science/tg-grade-10-physical-science-grade-course/x78128e17d2b1909f:atoms-and-molecules/x78128e17d2b1909f:molecules-and-ions/v/finding-the-formula-of-an-ionic-compound 2025-05-29T08:44:44.739717086Z Finding the formula of an ionic compound To find the formula of an ionic compound, we first identify the cation and write down its symbol and charge. Then, we identify the anion and write down its symbol and charge. Finally, we combine the two ions to form an electrically neutral compound. In this video, we'll walk through this process for the ionic compound calcium bromide. Dubverse video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Finding the formula of an ionic compound To find the formula of an ionic compound, we first identify the cation and write down its symbol and charge. Then, we identify the anion and write down its symbol and charge. Finally, we combine the two ions to form an electrically neutral compound. In this video, we'll walk through this process for the ionic compound calcium bromide. https://cdn.kastatic.org/ka-youtube-converted/-OVGvVUO2Us.mp4/-OVGvVUO2Us.mp4 178 Molecules and ions https://www.khanacademy.org/science/bridge-course-class-11th-chemistry/x426c9d2c554669cb:basic-concepts-of-chemistry/x426c9d2c554669cb:ionic-compounds/v/worked-example-formula-for-an-ionic-compound 2023-06-26T12:36:08.867767149Z Worked example: Formula for an ionic compound Let's understand how to write the formula for ionic compounds! Vibhor Pandey video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Worked example: Formula for an ionic compound Let's understand how to write the formula for ionic compounds! https://cdn.kastatic.org/ka-youtube-converted/rjsx6MP0Vos.mp4/rjsx6MP0Vos.mp4 211 Molecules and ions https://www.khanacademy.org/science/bridge-course-class-11th-chemistry/x426c9d2c554669cb:basic-concepts-of-chemistry/x426c9d2c554669cb:ionic-compounds/e/find-the-formula-for-ionic-compounds 2025-02-06T18:17:42.147590351Z Find the formula for ionic compounds Practice finding the formula when given the name of an ionic compound. Yuki exercise https://www.khanacademy.org/science/class-9-chemistry/x46dd29ce84a663ea:atoms-and-molecules/x46dd29ce84a663ea:writing-chemical-formulae/e/predicting-the-formula-of-the-given-ionic-compound 2026-03-06T09:40:40.837655949Z Predicting the formula of the given compound Let's solve a few problems to identify the correct formula of a given ionic compound. Aanchal Arora exercise