Answer Happy

1. The least metallic element will always end in the suffix "-ide". Remember that as you move to the right in a period, the elements become less metallic and as you move down a group, the elements become more metallic. 2. Prefixes will be used to indicate the number of atoms of each element in the formula. a. The first ten prefixes in increasing order are: mono, di, tri, tetra, penta, hexa, hepta, octa, nona and deca. b. If there is only one atom of the first element, the prefix mono is left out. For example, CO is carbon monoxide, not monocarbon monoxide. c. If a prefix ends in an "a" or "o" and the name of the element also starts with a vowel, the "a" or "o" of the prefix is dropped. Example, carbon monoxide - not carbon mongoxide. 3. Some compounds still go by their common names - such as water (H₂O), ammonia (NH3) and hydrogen peroxide (H₂O2). I Complete the following table: Name sulfur dioxide nitrogen trioxide tricarbon disulfide disulfur dichloride Silicon dioxide Formula SO3 Cl₂07 SCI₂ P₂S5 P4010