Question

what is the atomic weight of Se, if S,Se,Te are dobereiner triads​

Answer 1

Answer:

Atomic weight of Se = 79u

Explanation:

S | Se | Te

Sulfur has atomic mass of 32u

Tellurium's atomic mass is 127u

Atomic mass of Se = Mean of S and Te atomic mass

= 32 + 127 /2

= 159 /2

= 79u