Bài 2 trang 14 SGK Hóa học 10 Nâng cao

(eqalign{
& a),,,,,_{14}^{28}Si cr
& ,,,,,,,,,_{14}^{29}Si cr
& ,,,,,,,,,_{14}^{30}Si cr} )

(eqalign{
& 14 cr
& 14 cr
& 14 cr} )

(eqalign{
& 14 cr
& 15 cr
& 16 cr} )

(eqalign{
& 14 cr
& 14 cr
& 14 cr} )

(eqalign{
& b),,,,_{26}^{54}Fe cr
& ,,,,,,,,_{26}^{56}Fe cr
& ,,,,,,,,_{16}^{57}Fe cr
& ,,,,,,,,_{26}^{58}Fe cr} )

(eqalign{
& 26 cr
& 26 cr
& 26 cr
& 26 cr} )

(eqalign{
& 28 cr
& 30 cr
& 31 cr
& 32 cr} )