Question

Thallium consists of 29.5%TI-203 and 70.5%TI-205. What is the relative atomic mass of thallium?

Answer 1

atomic mass :

29.5 * 203 + 70.5 * 205 / 100 =

5988.5 + 14452.5 / 100 =

20441 / 100 = 204.41 u

atomic mass of Thallium 204.41 u

hope this helps!

Answer 2

Thallium atomic mass is 204.41.

Step-by-step explanation:

TI-203 and TI-205 are isotopes of Thallium, it means elements that differs in the number of neutrons they have. To estimate the atomic mass of Thallium, you have to sum the mass of each isotope (203 or 205), multiplied by its abundance percentage and divided by 100&.

Thallium Atomic mass = [(203 x 29.5 %)/ 100%] + [(205 x 70.5 %)/100%]

⇒Thallium Atomic mass = 204.41.

Summarizing, Thallium atomic mass is 204.41.