Aynı ya da farklı cins atomların bir araya gelmesiyle oluşan atom kümelerine ......... denir
Cümlede boş bırakılan yere aşağıdakilerden hangisi gelmelidir?

{"commentics_url":"\/\/www.sorubak.com\/yorum\/","page_id":380891,"enabled_country":false,"country_id":0,"enabled_state":false,"state_id":0,"enabled_upload":false,"maximum_upload_amount":3,"maximum_upload_size":5,"maximum_upload_total":5,"securimage":false,"securimage_url":"\/\/www.sorubak.com\/yorum\/3rdparty\/securimage\/securimage_show.php?namespace=cmtx_380891","cmtx_wait_for_comment":"cmtx_wait_for_comment","lang_error_file_num":"Only {{fi-limit}} files are allowed to be uploaded.","lang_error_file_size":"{{fi-name}} is too large! Please upload files up to {{fi-maxSize}} MB.","lang_error_file_total":null,"lang_error_file_type":"Only images are allowed to be uploaded.","lang_text_loading":"Y\u00fckleniyor ..","lang_placeholder_country":"Country","lang_placeholder_state":"State","lang_text_country_first":"Please select a country first","lang_button_submit":"G\u00f6nder","lang_button_preview":"\u00d6nizle","lang_button_remove":null,"lang_button_processing":"L\u00fctfen Bekleyiniz.."}