If number of electrons in an atom is 8 and number of protons is also 8, then (i) what is the atomic number of the atom? and (ii) what is the charge on the atom?

(i) The atomic number of an atom is determined by the number of protons it contains. In this case, you mentioned that the number of protons is 8. The atomic number is equal to the number of protons in the nucleus of an atom. Therefore, the atomic number of the atom in question is 8.

(ii) The charge on an atom is determined by the balance between the positively charged protons and the negatively charged electrons. If the number of electrons is equal to the number of protons, the atom is electrically neutral. In this scenario, both the number of electrons and the number of protons are 8, indicating that the charges balance each other out. Thus, the charge on the atom is neutral (0).