How many moles of diphosphorus pentoxide can be made from 1.23 moles of oxygen?

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Which element below could be and isotope of this atom