contestada

What do elements of the same period have in common?
number of valence electrons
O number of shells
O number of protons
O atomic mass

Respuesta :

roba34

Answer:

no of valence electrons

Explanation:

because valence electrons are the electrons present in the outer orbital

Answer:

its actually the number of shells

Explanation:

valence electrons are the same down any group. atomic orbitals, or shells, are the same across periods