元素周期表的周期是什么意思

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(866299,1106272,1097001,911872,2723122,666096,1096631,1122831,663084,1297783,703609,944539,638004,721929,442304,1109999,1102516,766258,924345,953046,386020,626834,739903,1105207,1114190,1108922,1092303,965035,1121324,1108139) ORDER BY field (ArticleID,866299,1106272,1097001,911872,2723122,666096,1096631,1122831,663084,1297783,703609,944539,638004,721929,442304,1109999,1102516,766258,924345,953046,386020,626834,739903,1105207,1114190,1108922,1092303,965035,1121324,1108139)