Answer the following questions without referring to Table2.1: (a) What are the main subatomic particles that makeup the atom? (b) What is the relative charge (in multiples ofthe electronic charge) of each of the particles? (c) Which of theparticles is the most massive? (d) Which is the least massive?

An unknown element contains 56 protons, 54 electrons, and has a mass number 135. Answer the following questions: (b) What are the name and symbol of this element?  (d) What is the charge on this ion? Is it a cation or an anion?

Write the symbol for each of the following ions:(a) the ion with a 3+ charge, 28 electrons, and a mass number of 71(b) the ion with 36 electrons, 35 protons, and 45 neutrons(c) the ion with 86 electrons, 142 neutrons, and a 4+ charge(d) the ion with a 2+ charge, atomic number 38, and mass number 87

a) Bromine has 2 naturally occruing isotpoes, Br-79 and Br-81. The mass of Br-79 is 78.92 amu with a percent abundance of 50.69%. If the atomic mass of bromine is 79.904 amu, calculate the mass and percent abudance of Br-81. b) How many litres of air are in a room that measures 12.0 ft x 12.0 ft and has an 8.00 ft ceiling? (1 in= 2.54 cm (exactly); 1L = 10^3 cm^3).