# How do you calculate the atomic mass of thalium?

Thalium is a meta element. Atomic mass of it is 204. Atomic number of it is 81.

### How do you calculate the atomic mass of an element with different isotopes?

To calculate average atomic mass from different isotopes of an element, we take into account the relative atomic masses of isotopes and their relative abundance on Earth. The following formula is used to calculate the needful : atomic mass = mass of isotope x percent abundance + mass of isotope x percent abundance / 100 (whole expression divided by 100)

### How is the atomic mass of each element on the periodic table calculate?

The atomic mass listed on most periodic tables is actually the average atomic mass representing the average atomic masses of the various isotopes of an element depending on their percent natural abundance. Refer to the answers.com question: What is the formula for finding average atomic mass? for a detailed explanation on how to calculate this value. (http://wiki.answers.com/Q/What_is_the_formula_for_finding_average_atomic_mass)