Massa atom relatif ??
Gambar no. 10
Suatu unsur X punya 2 isotop stabil X no. massa: 10;no. atom:5(19%) & Xno.massa: 11 ; no. massa:5(81%)
Jawaban Terkonfirmasi
Ar = % Isotop 1 × massanya + % Isotop 2 × massanya
= 19/100 × 10 + 81/100 × 11
= 1,9 + 8,91
= 10,81