The arrow is pointing to sodium's: A) Number of neutrons.
B) Number of valence electrons
C) Combined number of neutrons and protons
D) Combined number of electrons and protons

Combined number of neutron and protons

Explanation: Protons and Neutrons weigh the same as one on the atomic weight scale

ι вєℓινє тнє αиѕωєя тσ уσυя qυєѕтισи ιѕ в. ℓуѕσѕσмє

ι нσρє тнαт ι ¢συℓ∂ нєℓρ уσυ.

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek