1) how many shells are there in the Bohr model of a hydrogen atom? 2) how many valence electrons are there in Fluorine atom?
3) how many shells are there in the Bohr model of a silicone atom?
4) fill in the blanks besides each Bohr model diagram
a) Number of protons:
Number of shells:
Number of electrons:
Number of valence electrons:

b) Number of protons:
Number of shells:
Number of electrons:
Number of valence electrons:

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.