Do the elements shown in figure 6-2 belong to the same period or the same group on the periodic table?

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

What is a metal replacement reaction

Adeuteron, 21h, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. the plasma of deuterons in a nuclear fusion reactor must be heated to about 3.02×108 k . what is the rms speed of the deuterons? express your answer using two significant figures.