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:

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.