# How can we identify an isotope?

## How can we identify an isotope?

Isotopes are identified by their mass, which is the total number of protons and neutrons. There are two ways that isotopes are generally written. They both use the mass of the atom where mass = (number of protons) + (number of neutrons).

## What is an isotope symbol?

These differing atoms are called isotopes. To write the symbol for an isotope, place the atomic number as a subscript and the mass number (protons plus neutrons) as a superscript to the left of the atomic symbol. The symbols for the two naturally occurring isotopes of chlorine are written as follows: 3517Cl and 3717Cl.

## What is a full atomic symbol?

Lesson Summary. The complete nuclear symbol has the atomic number (number of protons) of the nucleus as a subscript at the lower left of the chemical symbol and the mass number (number of protons + neutrons) as a superscript at the upper left of the chemical symbol.

## What is the nuclide symbol?

Nuclides are commonly expressed in the form AZX, where A denotes the total number of protons and neutrons, Z represents the number of protons, and the difference between A and Z is the number of neutrons.

## What is Oxygen’s nuclide symbol?

Oxygen is a chemical element with symbol O and atomic number 8.

## What does the 4 in he represent?

Equations for Alpha Decay For example, an alpha particle (helium nucleus) is represented by the symbol 42He, where He is the chemical symbol for helium, the subscript 2 is the number of protons, and the superscript 4 is the mass number (2 protons + 2 neutrons).

## What is helium most used for?

Helium gas is used to inflate blimps, scientific balloons and party balloons. It is used as an inert shield for arc welding, to pressurize the fuel tanks of liquid fueled rockets and in supersonic windtunnels.

## What does the 4 in 42He mean?

Only \$2.99/month. A nuclide is. An atom with a specific number of neutrons and protons. What does the 4 in 4-2 He mean? The mass number.