If they are in the same group they have the same valence electrons but since I cannot see what you’re talking about I’m not sure what your question is
Remember velocity = distance/time so that mean you would do 60/3 which equals 20 so the speed(velocity) equals 20
Five valence electrons for one nitrogen and 10 valence electrons for two nitrogens
Answer: half life
Explanation: Radioactive decay follows first order kinetics and the time required for the decay of a radioactive material is calculated as follows:

t= time required
k= disintegration constant
x= amount of substance left after time t
a= initial amount of substance
when one half of the sample is decayed, one half of the sample remains and t can be represented as 
at
, 

