Elements in the same periodic table have the same

a) number of electrons
b) number of neutrons
c) atomic number
d) number of outer electrons

D is the correct answer.

The trend that follows a group (vertical lines) is that they each contain the same number of valence (outer) electrons

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

The correct answer should be "electrons orbit the nucleus in circular motions exactly as shown on the classic bohr model."