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a fost răspuns

aflati Za, Zb,Zc din relatiile - Za+Zb+Zc=20 / Za-Zb=Zc+2/ Za+Zb-Zc=4

Răspuns :

Ralucagabi
ZA+ZB+ZC=20
ZA-ZB=ZC+2
ZA+ZB-ZC=4=>ZA+ZB=4+ZC
4+ZC+ZC=20
4+2ZC=20
2ZC=20-4
ZC=16/2
ZC=8 =>O(oxigen)
ZA-ZB=ZC+2=>ZA-ZB=8+2=> ZA=10+ZB
10+ZB+ZB+8=20
2ZB+18=20
2ZB=20-18
ZB=2/2
ZB=1 =>H (hidrogen)
ZA=10+ZB
ZA=10+1
ZA=11=>Na (sodiu)

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