Neils bohr measured the eneray required to move the electron
hydrogen atom out of its ground state and the energy emitted when the
electron returned to its ground state. what did he learn about the structure of
the atom from this information?
a. the existence of the electron.
the law of multiple proportions.
c. the existance of the nucleus
d. that the electrons reside in the electron cloud in shells (or energy
levels) with fixed amounts of energy.

2b2t

explanation:

2b2t

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.