Review: Samsung Galaxy J7 for Boost Mobile. Samsung's mid-range Galaxy J7 finds solid footing among Boost Mobile's smartphone roster. This Android handset brings a lot to the table with a 5.5-inch screen, 13-megapixel camera, and Android 6 Marshmallow. Here is Phonescoop's full review.
As mentioned above, note that the atomic mass of an atom is not the same as its mass number. The mass number (symbol: A) of an atom is the sum of the number of protons and the number of neutrons in the nucleus. Mass numbers are always whole numbers with no units.Also, relative isotopic mass is not the same as isotopic mass, and relative atomic mass (also called atomic weight) is not the same as atomic mass.s mentioned above, note that the atomic mass of an atom is not the same as its mass number. The mass number (symbol: A) of an atom is the sum of the number of protons and the number of neutrons in the nucleus. Mass numbers are always whole numbers with no units.
An atom consists of a central nucleus surrounded by an electron cloud. The nucleus is a tightly packed ball made up of protons and neutrons. The mass of the proton and the neutron are nearly the same. The mass of the electron is about 1/2000 of that. The proton has a charge of +1. The neutron has a charge of 0. The electron has a charge of -1. The number of protons in the nucleus is called the atomic number. It tells us what the element is. Hydrogen has one proton, helium has two, lithium three, etc. The number of neutrons gives you the isotope of the given element.