Question

The element thallium is 70% thallium-205 and 30% thallium-203. Calculate its relative atomic mass to 1 decimal place

Answer 1

Hii dear,

# Answer-
Relative Atomic mass = 204.40 amu

# Explanation-

# Given-

Thallium-203 = 30%

Thallium-205 = 70%

# Solution-

Relative mass of thallium = (30×203 + 70×205)/100

Relative mass of thallium = (6090+14350)/100

Relative mass of thallium = (20440)/100

Relative mass of thallium = 204.40 amu

# Hence relative mass of thalium is 204.40 amu.

# Extras-

1)Thallium is used for infrared instruments and semiconductors.

2)Thallium and its compounds are very toxic causing multi-organ involvement.

Hope this is useful...