Get correct for brainleist! How can you tell if two elements are from the same period on the periodic table of elements?

a
Both are metals
b
Both have the same number of energy levels in an atomic model
c
Both have the same atomic number
d
Both have the same number of valence electrons

the dissolution of polymer can be thermodynamically described in 2 steps.

the transfer of heat by electromagnetic radiation is called thermal radiation . it is usually carried out by electromagnetic waves in an energy range just below the visible spectrum, which is the infrared range.

so the answer would be radiation.

: )