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25 Σεπ 2022 · Compounds between metal and nonmetal elements are usually ionic. For example, CaBr 2 contains a metallic element (calcium, a group 2 [or 2A] metal) and a nonmetallic element (bromine, a group 17 [or 7A] nonmetal). Therefore, it is most likely an ionic compound (in fact, it is ionic).
- 4.3: Formulas for Ionic Compounds
There are two ways to recognize ionic compounds. First,...
- 2.3: Naming Ionic Compounds
A Calcium is in group 2, so it forms only the Ca 2+ ion. B...
- 4.3: Formulas for Ionic Compounds
There are two ways to recognize ionic compounds. First, compounds between metal and nonmetal elements are usually ionic. For example, CaBr 2 contains a metallic element (calcium, a group 2A metal) and a nonmetallic element (bromine, a group 7A nonmetal). Therefore, it is most likely an ionic compound.
This formula indicates that there are three calcium ions (Ca 2+) for every two phosphate (PO 4 3−) (PO 4 3−) groups. The PO 4 3− PO 4 3− groups are discrete units, each consisting of one phosphorus atom and four oxygen atoms, and having an overall charge of 3−.
A Calcium is in group 2, so it forms only the Ca 2+ ion. B Dihydrogen phosphate is the H 2 PO 4 − ion ( Table 2.4 ). Two H 2 PO 4 − ions are needed to balance the positive charge on Ca 2+ , to give Ca(H 2 PO 4 ) 2 .
Calcium hydride is the chemical compound with the formula CaH2, an alkaline earth hydride. This grey powder (white if pure, which is rare) reacts vigorously with water, liberating hydrogen gas. CaH2 is thus used as a drying agent, i.e. a desiccant. [2] CaH2 is a saline hydride, meaning that its structure is salt-like.
The formula of an ionic compound must have a ratio of ions such that the numbers of positive and negative charges are equal. Example 6.2a. Formation of Ions. Magnesium and nitrogen react to form an ionic compound. Predict which forms an anion, which forms a cation, and the charges of each ion. Write the symbol for each ion and name them. Solution.
The name of a metal ion is the same as the name of the metal atom from which it forms, so Ca2+ Ca 2 + is called a calcium ion. When atoms of nonmetal elements form ions, they generally gain enough electrons to give them the same number of electrons as an atom of the next noble gas in the periodic table.
