AYm-中子數(shù)為y 則核外電子數(shù)是 ;AXn+質(zhì)子數(shù)為x則中子數(shù)是 .
【答案】分析:根據(jù)中子數(shù)、質(zhì)量數(shù)、質(zhì)子數(shù)之間的關(guān)系:中子數(shù)=質(zhì)量數(shù)-質(zhì)子數(shù),陽離子核外電子數(shù)=質(zhì)子數(shù)-電荷數(shù),陰離子核外電子數(shù)=質(zhì)子數(shù)+電荷數(shù).
解答:解:AYm-中子數(shù)為y,質(zhì)量數(shù)是A,設(shè)質(zhì)子數(shù)是Z,由A=Z+y,所以質(zhì)子數(shù)Z=A-y,AYm-核外電子數(shù)為A-y+m;
AXn+質(zhì)子數(shù)為x,則中子數(shù)=A-x.
故答案為:A-y+m;A-x.
點評:本題考查學(xué)生中子數(shù)、質(zhì)量數(shù)、質(zhì)子數(shù)之間的關(guān)系以及離子核外電子數(shù)、質(zhì)子數(shù)、電荷數(shù)之間的關(guān)系,可以根據(jù)所學(xué)知識回答,難度不大.