Question

2. The new element Odessium (Od) was discovered in 2020 by Mr. Green. It has three isotopes: Od-284

(34.60%), Od-285 (21.20%), and Od-288 (44.20%). What is its average atomic mass?|

Answer 1

Odessium (Od) has an average atomic mass of 284.45

Step-by-step explanation:

Average mass is calculated from the isotopes of an element weighted by their relative abundance.

To calculate the relative average mass, you need to find the % of each isotope and use these to calculate the relative average mass

• (34.60 %)/100 x 284=96.73
• (21.20 %)/100 x 285=60.42
• (44.20 %)/ 100 x 288=127.296

Add all 3 answers to get the relative average mass

• 96.73 + 60.42 + 127.296= 284.45