Two half lives so it is 4000 years old
Option B & Option D is your correct answers.
'cause here, atom has eight electrons in it's valence shell, so it means it has stable structure which falls in group 18
Hope this helps!
Answer:
The value of acceleration due to gravity is greater in terai than in mountain. In terai region the radius of earth is less as it lies close to the centre of the earth. Thus, the value of g is more in terai region.
I belive it it is C, using research to reform society
D) Less than 20.
Explanation:
Equivalent resistance in a parallel combination is less than their individual value.
