Question

write short notes on a) Doberneir triad b) Mendeleev c) periodic table​

Answer 1

Answer:

a)i)he introduced the traid which he named doberneir's traid.

ii)he kept 3 elements in a traid.

iii)average atomic mass of 1 & 3 element will be equal to 2nd

b)i)he was a who introduced periodic table.

ii)he placed the element into increaseing atomic mass

iii)he left some gap in the periodic table between elements as he predicted that many more new elements will be discovered in future

c)i)it is having 7 periods and 18 groups

ii) hydrogen has no fixed position in the periodic table

iii)Henry Mosley rather rectified the periodic table and named as modern periodic table