Question

atomic number ia consider to be a more appropriate parameter then atomic mass for classification of elementa in a periodic table..why?

Answer 1

Hey mate..
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The Atomic number is consider to be a more appropriate parameter then atomic mass for classification of elementa in a periodic table because of the following reasons :--

1) In Mendeléev's periodic table, Atomic mass do not increase in a regular manner in going from one element to the next but In Modern Periodic table, Atomic number increases by one on going from one element to the next and it creates no conflict.

2) In Mendeléev's periodic table , The position of hydrogen, which could not be decided by atomic mass because it reacted with halogens just like other alkalis, have been suited in the modern periodic table.

3) Isotopes were discovered long after Mendeléev had proposed the periodic classification of elements.
Thus, Isotopes of all the elements posed a challenge to Mendeléev's periodic table.

But, Unlike Mendeléev's periodic table though, The modern periodic table solves the problem of placing isotopes.

4) In Mendeléev's periodic table , it was not possible to predict how many elements can be discovered between two elements- especially when we consider heavier elements.

But, In Modern Periodic table , not only the atomic number enables a better arrangement of elements but also made it simpler for the chemists and scientists to predict how many elements can be discovered between two elements.

Hope it helps !!

Answer 2

HELLO DEAR,

Atomic Number is considered to be more appropriate parameter than atomic mass because it can be arranged accordingly and the modern periodic table is the proof. Unlike Mandaleev's periodic table though, It solves the problem of placing isotopes. Not only the atomic number enables a better arrangement of elements but also made it simpler for the chemists and scientists to predict how many elements can be discovered between two elements. 

Attomic mass on the other hand, do not have an accurate value, but atomic number have been taken accurately. Atomic mass have eneabled the discovery of many man made elements that we see in the modern periodic table. 

Moreover, The position of hydrogen, which could  not be decided by atomic mass because it reacted with halogens just like other alkalis, have been suited in the modern periodic table*. 

 

By all of this, we can rightly say that, The atomic number is considered to be more appropriate parameter than atomic mass of classification of periodic table. 

*The position of hydrogen too in the modern periodic table is debated yet till today as to whether it should be placed in the first group becasue its valency is one or whether it should be placed in the second group becasue its valency is not only one as that of gruop 17 but also it is a non-metal. 

I HOPE ITS HELP YOU DEAR,
REGARDED BY :- ROHIT KUMAR GUPTA.....
THANKS. :-)