Renewable fuels derived from biological matter are called:
a: alternative energy
b: challenges to green design
c: fossil fuels
d: biofuels

proton number of hydrogen :1

proton number of calcium : 20

number of electrons for fluorine : 9

number of electrons for iodine : 53

number of neutron hydrogen :0

number of neutron iodine : 74

number of neutron gold(Aurum) :118

Explanation:

to get the number of neutron by number of nukleon minus the number of proton..

gold is aurum

the number of nukleon u can get at the periodic table .. by looking at the biggest number.. thats all.. i hope u understanding my explanation :'D hhihi see ya