 
<translate> Ajụjụ bụ: Akpụkpọ ahụ́ nke ọ bụla nwere ike ịnwe nanị ọnụ ọgụgụ a kapịrị ọnụ nke ndị elektrọn: Akpụkpọ ahụ́ nke mbụ nwere ike ịnwe ihe ruru ndị elektrọn abụọ, nke abụọ nwere ike ịnwe ihe ruru ndị elektrọn asatọ (2 + 6), nke atọ nwere ike ịnwe ihe ruru ndị elektrọn iri na asatọ (2 + 6 + 10) na ihe ndị ọzọ. Ụkpụrụ n'ozuzu ya bụ na n-shell nwere ike ijide 2 (n) electrons. Ebe ọ bụ na a na-adọta ndị elektrọn n'ụzọ eletrik n'ebe etiti dị, ndị elektrọn nke atọm ga-ejikarị nanị ihe ndị dị n'ime jupụta n'ihe ndị ọzọ dị n'ime. Otú ọ dị, nke a abụghị ihe a chọrọ n'aka: atọm pụrụ inwe mkpuchi abụọ ma ọ bụ ọbụna atọ na-ezughị ezu. (Lee iwu Madelung maka nkọwa ndị ọzọ.) Maka nkọwa ihe mere elektrọn ji adị n'ime shells ndị a, lee nhazi elektrọn.  Zaa ajụjụ a: kedu ọnụọgụgụ kachasị nke elektrọn n'ime mkpuchi ike mbụ nke atọm? Mmetụta uche: Ihe dị mkpa maka ịza ajụjụ a bụ: Akpụkpọ ahụ ọ bụla nwere ike ịnwe naanị ọnụọgụ nke electrons: Akpụkpọ ahụ mbụ nwere ike ijide elektrọn abụọ, nke abụọ nwere ike ijide elektrọn asatọ (2 + 6), nke atọ nwere ike ijide 18 (2 + 6 + 10) na ihe ndị ọzọ. <eng> The question is: Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2 (n) electrons. Since electrons are electrically attracted to the nucleus, an atom's electrons will generally occupy outer shells only if the more inner shells have already been completely filled by other electrons. However, this is not a strict requirement: atoms may have two or even three incomplete outer shells. (See Madelung rule for more details.) For an explanation of why electrons exist in these shells see electron configuration.

Answer this question: what is the maximum number of electrons in the first energy shell of an atom?
Stream of consciousness: The important part for answering this question is: Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on.
 