Question

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Answer 1

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Answer 2

2.
Atom-Siliciu, Z=14, Nr p+= 14, Sarcina nucleara = + 14, Nr. de masa A= 24, nr, n°= 10, nr e-= 14
Atom- Cupru, Nr atomic Z=29, nr p+= 29, Sarcina nucleara= +29, Nr de masa A= 64, Nr n°= 35, nr e-=29
3. Atom-Argon, Nr Z= 18, nr p+ = 18, Sarcina nucleara= +18, Nr de masa A= 40, nr n°= 22, nr e-= 18
4. Atom- Magneziu, Nr Z=12, nr p+= 12, Sarcina nucleara = +12, Nr de masa A=24, nr n°= 12, nr e-= 12



3. X
Z=8; A=2Z=> A=16
nr n°=8



4.Izotopii sunt cei care difera prin numarul de neutroni (c)



5. a) Sodiu-Na
Fosfor- P
Clor-Cl
Mercur-Hg
Azot-N
Potasiu-K
Fier-Fe
b) Mg- Magneziu, Ar-Argon, Ne-Neon, O-Oxigen, F-Fluor, Ca-Calciu, He-Heliu, Li-Litiu, Be-Beriliu
c) Azot : A=13, A=14, A=15, A=16
Zinc: A= 64, A=65, A=66, A=67, A=68, A=69, A=70
Cupru: A=29
Aluminiu:A= 26, A= 27, A=13




6. K=2e-, L=8e-, M=8e-, N=2e-



7. A=? Z=12 n°=p+
p+= 12=> n°=12=> A=24
K=2e-, L=8e-, M=2e-



8. a)
1mol Al...27g
x moli Al... 81g
x= 81/27
x=3 moli Al
b)
5moli S...x grame
1mol S....32
x= 32x5
x= 160g