How to calculate the weight of a pencil of mass 5g​

Porque crees que el agua no podia subir mas de 10 m de altura con ese tipo de bomba

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

Which is an example of an exothermic process?