Un estudiante preparó un modelo Tierra / Luna en el que las dos esferas estaban separadas por 100 m. ¿Cuáles eran los diámetros de las esferas?​

12 is probably the typical age for a first kiss but i think its to young.

Your question is not clear but if you can explain yourself i would be glad to .  just trying to : ))

Order of filling levels and sublevels of electrons: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²3f¹⁴5d¹⁰6p⁶for an element with 5 electrons in the 3d energy level: full configuration: 1s²2s²2p⁶3s²3p³.