Consider an element Z that has two naturally occurring isotopes with the following percent abundances: the isotope with a mass number of 17 is 45% abundant; the isotope with a mass number of 20 is 55 % abundant. What is the average atomic mass for element Z?​

2points why do scientists need governmental funding? o a. government politicians ask all the important scientific questions. o b. scientists have to pay taxes to the government on the money they make. o c. the cost of doing scientific research can be very high. o d. the government is controlled by scientists. submit

How many moles of al3+ ions are in 1.25 moles of al2o3

Which of the following shapes would represent a molecule with two bonded atoms and 3 lone pairs on only one of them , trigonal planar , bent , trigonal pyramidal , linear