Answers

2016-03-24T22:34:03+05:30
At the end of the periodic table or according to its atomic number
1 5 1
Very good answer..................
Mark as brainliest plz
2016-03-24T22:39:42+05:30
May be adding of extra group or extra period.

Please mark it brainiest answer........................
1 5 1
Please mark it brainiest answer....................