Write the formula for each of the following compounds:
a. cesium bromide
b. barium sulfate
c. ammonium chloride
d. chlorine monoxide
e. silicon tetrachloride
f. chlorine trifluoride
g. beryllium oxide
h. magnesium fluoride
Good grief, you should be able to figure these out. Most of them are ionic bonds with easily looked up electron configurations and resulting valences.
Try Googling Cesium Bromide for example:
https://en.wikipedia.org/wiki/Caesium_bromide
Memorize the valence of each of those elements. It wont be difficult.
a. The formula for cesium bromide can be determined using the charges of the ions. Cesium is a group 1 element, so it has a +1 charge, while bromine is a group 17 element and has a -1 charge. To balance the charges, we need one cesium ion and one bromide ion. Therefore, the formula is CsBr.
b. Barium sulfate consists of a barium ion (Ba2+) and a sulfate ion (SO4^2-). To determine the formula, we need to balance the charges. Since the sulfate ion has a -2 charge, we need two barium ions to balance it out. Therefore, the formula is BaSO4.
c. Ammonium chloride comprises an ammonium ion (NH4+) and a chloride ion (Cl-). The ammonium ion has a +1 charge, while the chloride ion has a -1 charge. To balance the charges, we need one ammonium ion and one chloride ion. Thus, the formula is NH4Cl.
d. Chlorine monoxide consists of a chlorine atom (Cl) and an oxygen atom (O). Since both elements are nonmetals, they can form a covalent bond together. Therefore, the formula is ClO.
e. Silicon tetrachloride consists of one silicon atom (Si) and four chlorine atoms (Cl). The prefix "tetra" indicates that there are four chlorine atoms. Therefore, the formula is SiCl4.
f. Chlorine trifluoride comprises one chlorine atom (Cl) and three fluorine atoms (F). The prefix "tri" indicates that there are three fluorine atoms. Therefore, the formula is ClF3.
g. Beryllium oxide consists of one beryllium ion (Be2+) and one oxygen ion (O2-). To balance the charges, we need two beryllium ions for every one oxygen ion. Thus, the formula is Be2O.
h. Magnesium fluoride consists of one magnesium ion (Mg2+) and two fluoride ions (F-). To balance the charges, we need two fluoride ions for every one magnesium ion. Therefore, the formula is MgF2.