Calcium has 20 protons and 20 neutrons. This element is number 20 on the Periodic Table of the Elements and has an atomic weight of 40.078.
A neutron has a slightly greater mass than a proton. According to Dick Plano, professor emeritus of physics at Rutgers University, there are many hypotheses for the mass difference, but a universally accepted hypothesis does not exist.
One neutral atom of nitrogen has seven protons, seven neutrons and seven electrons. This element is found in group 15 and period 2 of the Periodic Table of the Elements. It has an atomic weight of 14.007 amu.
Fluorine has nine protons, nine electrons and 10 neutrons. The number of protons and electrons within an atom are always equivalent when an atom is in a stable state. The negatively charged electrons balance out the positively charged protons, rendering the atom electrically neutral.
One neutral atom of bromine has 35 protons, 35 electrons and 45 neutrons, according to ChemicalElements.com. Bromine has an atomic number of 35.
One atom of aluminum has 13 protons and 14 neutrons. Protons are the positively charged particles in an atom, while neutrons are subatomic particles that have no charge.
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.
The isotope with 13 protons and 14 neutrons is aluminum-14. The element of the isotope can be determined by either the number of electrons or protons, which are equal to the atomic number of an element. In the case of aluminum, it has an atomic number of 13.
Boron-11 is a chemical element that has five protons and six electrons. It is an uncommon element that is rarely found in the Earth's crust or atmosphere.
Neutrons are always found within the atom's nucleus. They are one of the three main building blocks on an atom, along with protons and electrons. Each type of element has a specific number of each of these building blocks, which can easily be determined by consulting the periodic table of elements.