Which of these periods contain elements with electrons in s, p, d, and forbitals?
a periods 1-3
b. periods 1-4
c. periods 3-5
d. periods 6-7

I learnt k,l,m

Explanation:

so 1-3periods have klm and after that klmn

The periods that would contain elements with electrons in s, p, d, and f orbitals are periods 6-7

Explanation:

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.