Question

maximum number of elements available
in elemental form
1) 26 2) 92 3) 111 4) 118
Which of the following is Dobereiner triad
1) Li, Na, K 2) Fe, Co, Ni
3) Ru, Rh, Pd 4) Os, Ir, Pt
Number of short periods in short form of
periodic table
1) 3 2 )2 3 )4 4 )6
Considering the chemical properties ,atomic weight of the element 'Be' was corrected
based on
1) Valency
2) Configuration
3) Density
4) Atomic volume
​

Answer 1

Answer:

hjkniohuokhyjkiiiiioo

Answer 2

Answer:

be valency +4

configuration (2,4)