wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

The Dobereiner's Triad given to you is Li, Na and K. If the atomic masses of Na and K in the Dobereiner's Triad is 23 and 39 respectively. Find the atomic mass of Lithium.


A

7.5

No worries! We‘ve got your back. Try BYJU‘S free classes today!
B

7

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C

6.5

No worries! We‘ve got your back. Try BYJU‘S free classes today!
D

6

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B

7


We are given that the Li, Na and K are a Dobereiner's Triad.

Let the atomic mass of Lithium be x

We know that the average of the atomic masses of Li and K is equal to Na as they are in the same Dobereiner's Triad.

So we can calculate the atomic mass of Lithium like this

x+392=23

x+39=23×2

x+39=46

x=7

So the atomic mass of Lithium is 7


flag
Suggest Corrections
thumbs-up
2
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Dobereiner's Triads
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon