Question

Which is not a doberinar traid

Answer 1

Answer:

Speaking of Dobereiner Traits, these are special groups of elements which are placed in Groups of three each.

As per the Law, the elements have to be organized in their groups in order of their increasing Atomic masses. These groups are then termed as common traits. These are elements that within their organized groups also exhibit similar chemical properties.

There is something more to it. The element in the group that is placed in the middle position is the one who has AM (arithmetic mean ) is equal to the sum of atomic masses of the first and the third element in the group.

So, when understanding this, we also known that not all elements exhibit this trait. Not all elements in the periodic table can be termed as Doberiner traits.

So if there are any of the two elements in the group that has a very low and very high atomic mass number, then these elements do not exhibit Doberiner traits.

Here for the options provided by you,  

a).  Li, Na, K  

Li (7) , Na (23) , K (39)  = Li + K = 7 + 39 = 46 / 2 = 23 = Na (middle element) so this is a Dobereiner traits.

d). Cl (35.5) , Br (80) , I (127) = Cl + I = 35.5 + 127 = 162.5 / 2 =81.25 = Br (appx.) is a Dobereiner trait.

c). Ca (40) , Sr (88) , Ba (137) = Ca + Ba = 40 + 137 = 177 / 2 = 88.5 = Sr (appx.) is a Dobereiner trait.

But the last one B). Be (9) , Mg (24.3) , Cr (51.9) = Be + Cr = 9 + 51.9 = 60.9 / / = 30.45 is not equal to Mg . so it is not.

Explanation:

Answer 2

Answer:

Which of the following is not a Dobereiner triad?

Option 1 Cl, Br, I

Option 2 Ca, Sr, Ba

Option 3 Li, Na, K

Option 4 Fe, Co, Ni

Correct AnsweR 4

Explanation Conceptual

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