Nitrogen is an element. What is the smallest particle of nitrogen that has all the properties of nitrogen?

Are hallucinogen a clinically useful drugs?

Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

Which of the following pairs of elements belong to the same groupa. h and he b. li and bec. c and pb d. ga and ge