A because for example in n=4 we have all of these sub levels 4s is completed sooner than 4p and so
- The atomic mass of carbon is 12.011 g/mol.
- The atomic mass of hydrogen is 1.00794 g/mol.
This means the molar mass of CH is

Dividing the given molar mass by this,
This means the molecular formula is 
Answer:
B
Explanation:
Oil > Animals > Plants > Chemicals
Doping Se (group VI elements) with P(group V)elements would produce a P-TYPE semiconductor with HIGHER conductivity compared to pure Se
the reason is P dopant will introduce holes in the Se as P has lesser valence electron