Question

The actual atomic weight of an element is represented in

a.number

b."u"

c."amu"

d."mu"

Answer 1

Answer :- option (b) and (c)

Explanation :- actual atomic weight is found with help of isotopes of an element and their abundance on the Earth .It is represented by ' amu ' or in short way ' u '
Like an example , oxygen has three isotopes . ¹⁶O, ¹⁷O and ¹⁸O . Abundance of ¹⁶O = 96.74 % , abundance of ¹⁷O = 0.04 % and abundance of ¹⁸O = 0.20 % . After solving this we get actual atomic weight of Oxygen = 15.999u or amu

Answer 2

Hello Dear.

Here is your answer----


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The Actual Atomic Weight of the Elements is represented  by the Symbol amu [ Atomic Mass Unit]. Sometimes we also denote this with the symbol u which is called as unit.


Thus, both the options b. and c. are correct.


For Example--- The atomic weight of the Nitrogen is 14 amu.[Atomic Mass Units]
It can also be called as 14 u.

The amu[Atomic Mass Unit]  and u [Units] are mathematically equals.

For sometime, we write amu [Atomic Mass Unit]equals to the grams but mathematically there is a lot of difference between them. 

Thus, Relations between the Atomic Mass Units(a.m.u.) or Unit(u) is---


 1 a.m.u. = 1.66 × 10⁻²⁴ grams.


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Hope it helps.


Have a nice day.