div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imagea href=https:reader039fdocumentsusreader039viewer20220217185b94d66109d3f2214e8b9420html5page1jpg target=_blank img data-url=documenth-ws-half-life-key-conejo-valley-unified-school-chemw-60-one-half-life-afterhtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: H ws Half Life key - Conejo Valley Unified School … ChemW… · 60 one half-life after two half-lives If 250 grams of iodine-131 are left after 40 days 125 Sample IS loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader039fdocumentsusreader039viewer20220217185b94d66109d3f2214e8b9420html5thumbnails1jpg width=140 height=200 adivdiv