28
There is no 1-digit number that is equal to 14 and 28.
42 - 28 = 14
14³ - 28 = 2716
54 - 28 = 26
Atomic mass: 28 Protons:14 Neutrons:14 Electrons:10 To find the neutrons, do the mass number of the element minus the atomic number of the element
14 is less than 28 or 14 < 28
14 is less than 28 or 14 < 28
Silicon has atomic number 14 and therefore must have 14 protons in each nucleus. If the atom is electrically neutral, it must also have 14 electrons. The number of neutrons is the mass number minus the number of protons, which in this instance is also 14.
14 + 14 = 28
28