The catalytic converter in a car, using Platinum as the catalyst, is an example of a(n) . A. exergonic catalyst B. endergonic catalyst C. homogeneous catalyst D. heterogeneous catalyst E. autocatalyst

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  

just did the assignment and the answer was #1 +2 n

that's what i got you can count the number of atoms

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.