An atom with an atomic number of 12 and a mass number of 25 can best be described by which of these? a. an atom that contains 12 protons and 13 neutrons. b. an atom that contains 13 protons and 12 neutrons. eliminate c. an atom that contains 12 protons and 25 neutrons. d. an atom that contains 25 protons and 12 neutrons.

What can be found in the ionosphere

For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4al(s)+3o2(g)→2al2o3(s) a) 1 molal, 1 mol o2 b) 4 molal, 2.6 mol o2 c) 16 molal, 13 mol o2 d) 7.4 molal, 6.5 mol o2

Acm ruler with main graduations from 1 to 10 from left to right there are 10 secondary graduations between each of the main graduations there is a line that begins. at the left end of the ruler 10 secondary graduations to the left of the “1 main graduation the right end of the line ends on the eighth secondary graduation to the right of 3 how long is the line