1a. what trend do you note for the atomic
radii of the third period?

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As you move across the period, the atomic radii decreases

This is due to the increase of protons (and thus, increase in nuclear charge)

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each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i  

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.