Lead-212 is unstable and has a half-life of 10.6 mins. Lead-212 undergoes a 5 points Efeta (-), Beta (-), and Alpha decay series to arrive at a stable element.
What is the element this particular decay series produces?
Pb-212
Pb-207
Bi-212
Pb-208
Po-212

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.