What element is represented by the electron configuration below?*
[Rn]7s25f146d6

the answers would be

the first one and the second one

16

explanation:

the marks go by 4s

the maximum mass of nh3 is nh3 in grams

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.