Xenon has 54 protons, 77 neutrons, and 54 electrons.
65.5 is the answer. You could get it by adding the two numbers and dividing the sum by 2.
54 is 70.13% of 77.
54 doesn't go evenly into 77. 54 goes into 77 once with a remainder of 23.
The mass number is the sum of the number of protons and neutrons in an atom. Since xenon has an atomic number of 54, it has 54 protons. Adding the 77 neutrons to this gives us a total of 131 nucleons (protons + neutrons), making the mass number of this xenon isotope 131.
The atomic number for an element with 54 protons is 54. For the atoms with 77 neutrons, the mass number would be 54 (protons) + 77 (neutrons) = 131. For the atoms with 79 neutrons, the mass number would be 54 (protons) + 79 (neutrons) = 133.
the real numbers between 66 and 77 are (66,67,68,69,70,71,72,73,74,75,76,77)
The GCF is 1.
(-54) - 23 = -77
78 - 89 are the numbers that come between 77 and 90.
The protons and neutrons are packed together in the middle and the electrons have space to move, around them. logically their should be MORE neutrons and protons,but this depends on the size of the atom and how many atoms in the neon. info from SUSSEX UNIVERSITY.
The percentage of girls started at 77% and dropped to 54% with no boys leaving. As the total number of students was 100, 54% means there are 54 girls still there. As 77 minus 54 is 23, that is how many girls left. N=23.