Then, we can subtract 15 from both sides of the equation to determine that the number of neutrons is 16. We can substitute the mass number and number of protons into the equation. We can use this relationship to determine the number of neutrons in an atom of phosphorus-31. So the mass number can be expressed as the sum of the number of protons and the number of neutrons. Nucleons collectively refer to protons and neutrons. Mass number, represented by a capital 𝐴, indicates the number of nucleons in an atom or ion. 31 is the mass number of a phosphorus-31 atom. The name phosphorus-31 provides useful information for answering this question. The question asked us how many neutrons there are in an atom of phosphorus-31. The periodic table lists the atomic mass of carbon as 12. This means that an atom of phosphorus-31 will have 15 protons. The molar mass of any substance is its atomic mass, molecular mass, or formula mass in grams per mole. We are told that phosphorus-31 has an atomic number of 15. In science, simplicity and beauty are often equated - and that makes hydrogen as beautiful as they come, a single proton and a lone electron making the most compact element in existence. The atomic number also represents the number of protons in the nucleus of all atoms or ions of a particular element. Forget 10 Downing Street or 1600 Pennsylvania Avenue, the most prestigious address in the universe is number one in the periodic table, hydrogen. When looking at a cell on the periodic table, the atomic number is frequently written above the element symbol. How many neutrons are there in an atom of phosphorus-31?Ītomic number, represented by 𝑍, can be used to distinguish one element from another as each element has its own unique atomic number. Phosphorus-31 has an atomic number of 15.

Molar mass of phosphorus periodic table