Which of the following elements follow Dobereiner's law of Triads?

Na =

23

, Li =

7

and K =

39

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

Cl =

35

, Br =

80

and F =

19

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

Ca =

40

, Mg =

24

and Sr =

88

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

Na =

23

, K =

39

and Rb =

85

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

Open in App

Solution

The correct option is D Na = $23$ , Li = $7$ and K = $39$
According to Dobereiner's, the atomic weight of the middle element is nearly the same as the average of the atomic weights of the other two elements.

$L i (7) + K (39) ⟶ \frac{7 + 39}{2} = N a (23)$

So, $N a = 23, L i = 7$ and $K = 39$

The correct option is ( A )

Suggest Corrections

Similar questions

[Given: Atomic mass of elements : L i = 6.9, N = 14, N a = 23, P = 31, C l = 35, K = 39 C a = 40, A s = 74.9, B r = 79.9, S r = 87.6, I = 126.9, B a = 137.3]

Question 29
Can the following groups of elements be classified as Dobereiner’s triad?

(a) Na, Si, Cl

(b) Be, Mg, Ca

Atomic mass of Be 9; Na 23; Mg 24; Si 28; Cl 35; Ca 40. Explain by giving reason.

Which of the following can form Dobereiner’s Triads: with Li(u = 6.9) and Na(u = 23)?

Which of the following can form Dobereiner’s Triads: with Li(m = 6.9) and Na(m = 23)?

Join BYJU'S Learning Program