imo92

I was going through my chemistry text book and found a paragraph about exceptions to octet rule. it says that in PCl5 phosphorus breaks the octet rule because it has empty orbital 3d. then it shows an elocton con figuration: 1s2 2s2 2p6 3s2 3p2 3d0. in an earlier chapter it states that before 3d can be filled 4s has to be filled as 3d has more energy. i'm confused here can someone plz help. thnx alot

dont u need a credit card to order online. i don't have one yet but i will in about six months. i'm building it with my friend who had one before which he brought with him from canada. it broke after he lost control and crashed it on a road where a car ran it over. few parts survived. we are now rebuilding it but it will be much simpler. we have one servo, 3 motors( 2 from cheap rc cars and 1 from a busted cd-rom drive). we are using the swash plate and rotor hed of the old one. we r going to make it fixed pitch cause we only have one servo. most of the parts have been assembled but the main problem is the blades. we tried to make some out of 2 rulers which didn't work. we are now trying to make them out of wood from some old furniture. by the way do u build rc heli's?

i'm making a rc helcopter and i need help making the main rotor blades. i live in saudi arabia where there are very few hobby shops therefore i cant buy them. can someone plz give me advice on what materals to use or on how to make them. thnx alot:embarass: