help needed for (ii).......
Attachments:
Answers
Answered by
1
Answer:
It's Nitrogen, since nitrogen contains five elections in its valence shell
Answered by
1
he arrange all the known metals in there increasing atomic numbers and with the similar properties
he arrange all the known metals in there increasing atomic numbers and with the similar properties advantages :-
systematic study of element
prediction of new elements
noble gases
correction if doubtful atomic weights
disadvantages :-
position if hydrogen
position of isotopes
anomalous pairs of elements
grouping together of some elements with dismilar properties
fails to explain the cause of periodicity
hopes it's helps uh!!!!!!!!!!!!
Similar questions