To determine whether people have worked enough to meet the requirements, the SSA requires people to earn a certain number of work credits. Work credits are essentially income that is assigned a value. In general, you must have accumulated 40 work credits (20 in the past 10 years) to be eligible for disability.
Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. Its properties are thus intermediate between those of chlorine and iodine.
N.B. the 64.130 value is the weight of two sulfurs. Problem #3: A compound is found to have the formula XBr2, in which X is an unknown element. Bromine is found to be 71.55% of the compound. Determine the identity of X. Solution #1: 1) Determine molar mass of XBr2. 159.808 is to 0.7155 as x is to 1.