1 What group and period does this element belong in? A periodic cable is needed to answer this question
1. period 1 and group 3
2. period 2 and group 3
3. period 3 and group 1
4. period 3 and group 2

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm

Uranium can supply energy for the worlds electricity without admitting harmful greenhouse gases which of these statements best describes an outcome of uranium mining