RÄspuns :
A; Z=x-1 ā A= 8-1 ā A = 7
B; Z=2x+3 ā B = 2*8+3 ā B=19
C; Z=9-x ā C = 1
A+B+C = 27 <=> x-1+2x+3+9-x = 27 => 2x+11 = 27 => 2x=16 => x=8
Elementele corespunzatoare: N, Z=7 , K, Z=19 si H, Z=1
2. m = 28g Nā
n=m/M = 28/28 =1 mol Nā
nr atomi Nā = 2*NA = 2*6,022*10^23 = 12,044*10^23 atomi
12g C (1 mol)........................6,022*10^23 atomi
xg C.......................................12,044*10^23 atomi
x=(12*12,044*10^23)/ 6,022*10^23 = 24g C
3. m = 48g Mg
n=m/M = 48/24 = 2 moli Mg
nr atomi Mg = 2*NA = 2*6,022*10^23 = 12,044*10^23 atomi
32g Oā (1 mol).............................2*NA = 12,044*10^23 atomi
xg Oā .......................................................12,044*10^23 atomi
x=32g Oā
4. a) 1sĀ²/2sĀ² 2pā“ ā Z=8
b) 1sĀ²/2sĀ² 2pā¶/3sĀ² 3pāµ ā Z=17
c) 1sĀ²/2sĀ² 2pā¶/3sĀ² 3pā¶/4sĀ²3dā¶ ā Z=26
d) 1sĀ²/2sĀ¹ ā Z=3
e) 1sĀ²/ ā Z=2
5. a) 1sĀ²/2sĀ² 2pĀ³ ; Z = 7
b) 17pāŗ ā Z=17 ; 1sĀ²/2sĀ² 2pā¶/3sĀ² 3pāµ
c) 1sĀ²/2sĀ² 2pā¶/ ; Z=10
B; Z=2x+3 ā B = 2*8+3 ā B=19
C; Z=9-x ā C = 1
A+B+C = 27 <=> x-1+2x+3+9-x = 27 => 2x+11 = 27 => 2x=16 => x=8
Elementele corespunzatoare: N, Z=7 , K, Z=19 si H, Z=1
2. m = 28g Nā
n=m/M = 28/28 =1 mol Nā
nr atomi Nā = 2*NA = 2*6,022*10^23 = 12,044*10^23 atomi
12g C (1 mol)........................6,022*10^23 atomi
xg C.......................................12,044*10^23 atomi
x=(12*12,044*10^23)/ 6,022*10^23 = 24g C
3. m = 48g Mg
n=m/M = 48/24 = 2 moli Mg
nr atomi Mg = 2*NA = 2*6,022*10^23 = 12,044*10^23 atomi
32g Oā (1 mol).............................2*NA = 12,044*10^23 atomi
xg Oā .......................................................12,044*10^23 atomi
x=32g Oā
4. a) 1sĀ²/2sĀ² 2pā“ ā Z=8
b) 1sĀ²/2sĀ² 2pā¶/3sĀ² 3pāµ ā Z=17
c) 1sĀ²/2sĀ² 2pā¶/3sĀ² 3pā¶/4sĀ²3dā¶ ā Z=26
d) 1sĀ²/2sĀ¹ ā Z=3
e) 1sĀ²/ ā Z=2
5. a) 1sĀ²/2sĀ² 2pĀ³ ; Z = 7
b) 17pāŗ ā Z=17 ; 1sĀ²/2sĀ² 2pā¶/3sĀ² 3pāµ
c) 1sĀ²/2sĀ² 2pā¶/ ; Z=10
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