Web Results


The sum of protons and neutrons is the mass number. The mass of an atom is contained mainly within the nucleus where the protons and neutrons live. An electron's mass does not contribute significantly to the mass of the atom. Each proton and each neutron is given an atomic mass of one.


Masses of Atoms; Section 2. STUDY. PLAY. composed mostly of the protons and neutrons in the nucleus. atomic mass. ... the sum of the number of protons and neutrons in the nucleus of an atom is the ___ mass number. atoms of the same element with different numbers of neutrons. isotopes.


I get the impression some people just answers randomly. The sum of the number of protons and neutrons of an atom is its mass number (2). Furthermore, the element number is the number of protons; and the atomic weight is the ratio between the average mass of the element and 1/12 of the mass of a carbon 12 atom.


Mass number is the sum of protons and neutrons in the nucleus of an atom. The atomic number of silicon is 14, so the number of protons in the nucleus of a silicon atom is 14. If the isotope of ...


Mass number, on the other hand, is the sum total of protons and neutrons of an atom. To determine the number of protons and neutrons in the atoms of a given element, we need to know the atomic ...


The sum of the number of protons and neutrons in the atomic nucleus is called the atomic mass number. *Related Information: One element may exist as a mixture of atoms with different numbers of ...


Mass number The sum of the number of protons and neutrons in an atom is called the mass number. For example: Carbon-12 has 12 protons and 12 neutrons. 12+12=24, so the mass number of C-12 is 24 (no units).


the sum of the numbers of proteins and neutrons in the nucleus of an atom What is an isotope? An atom that has the number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)


Atoms are made of protons, neutrons, and electrons. Protons carry a positive electrical change, while electrons are negatively charged, and neutrons are neutral. A neutral atom has the same number of protons and electrons (charges cancel each other out). An ion has an unequal number of protons and electrons.


Isotope elements have same number of protons but different number of neutrons. Answer 3 : As stated in the answer 1, atomic mass of an atoms is the sum of all protons and neutrons in it's nucleus. So, this carbon isotope has 6 protons and 7 neutrons in its nucleus so : 7+6=13 . It's atomic mass is 13 atomic mass unit.(amu)