3. Which element have only one valence electron? (10 puntos)
Be
S
Kr
Cs

15 points

Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes

How have the greenhouse gasses increased from the year 2000 to 2018

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.