Question

isotopes: trouver le message
dans le tableau ci - dessous, complète les informations manquantes à laide dun tableau périodique.
isotope | notation standard | masse atomique | numéro atomique | nombre de protons | nombre de neutrons | nombre délectrons
h - 2 | (ce{^2_1h}) | 2 | 1 | 1 | 2 | 1
c - 14 | (handwritten) | 14 | 6 | 6 | | 6
cl - 37 | (ce{^{37}_{17}cl}) | 37 | 17 | 17 | | 17

			28	30	28
		28	28	32	28
			29	36	29

se - 78 | | | | | |
kr - 86 | (handwritten) | | | | |

	79			44
	81			46

u - 235 | u | | | | |

	204			122
	204			124
			76	114	76

Answer:

To solve for the missing values in the isotope table, we use the following relationships:

• Atomic Number (Z) = Number of Protons = Number of Electrons (for neutral atoms).
• Mass Number (A) = Number of Protons + Number of Neutrons.
• Standard notation: $\boldsymbol{^A_Z \text{Element Symbol}}$, where $A$ = mass number, $Z$ = atomic number.

1. C-14 (Carbon-14)

• Atomic Number (Z): Carbon has $Z = 6$ (from periodic table).
• Number of Neutrons: $A - Z = 14 - 6 = 8$.
• Number of Electrons: Equal to protons, so $6$.
• Standard Notation: $\boldsymbol{^{14}_6\text{C}}$.

2. Cl-37 (Chlorine-37)

• Number of Neutrons: $A - Z = 37 - 17 = 20$.
• Number of Electrons: Equal to protons, so $17$.

3. Isotope with 28 Protons, 30 Neutrons

• Atomic Number (Z): $28$ (protons = Z).
• Mass Number (A): $28 + 30 = 58$.
• Element: Nickel (Ni, $Z = 28$).
• Standard Notation: $\boldsymbol{^{58}_{28}\text{Ni}}$.
• Number of Electrons: $28$ (neutral atom).

4. Isotope with 28 Protons, 32 Neutrons

• Mass Number (A): $28 + 32 = 60$.
• Atomic Number (Z): $28$ (protons = Z).
• Element: Nickel (Ni).
• Standard Notation: $\boldsymbol{^{60}_{28}\text{Ni}}$.
• Number of Electrons: $28$ (neutral atom).

5. Isotope with 29 Protons, 36 Neutrons

• Atomic Number (Z): $29$ (protons = Z).
• Mass Number (A): $29 + 36 = 65$.
• Element: Copper (Cu, $Z = 29$).
• Standard Notation: $\boldsymbol{^{65}_{29}\text{Cu}}$.
• Number of Electrons: $29$ (neutral atom).

6. Se-78 (Selenium-78)

• Atomic Number (Z): Selenium has $Z = 34$ (periodic table).
• Number of Neutrons: $78 - 34 = 44$.
• Number of Electrons: $34$ (neutral atom).
• Standard Notation: $\boldsymbol{^{78}_{34}\text{Se}}$.

7. Kr-86 (Krypton-86)

• Atomic Number (Z): Krypton has $Z = 36$ (periodic table).
• Mass Number (A): $86$.
• Number of Neutrons: $86 - 36 = 50$.
• Number of Electrons: $36$ (neutral atom).
• Standard Notation: $\boldsymbol{^{86}_{36}\text{Kr}}$.

8. Isotope with Mass 79, 44 Neutrons

• Atomic Number (Z): $A - \text{neutrons} = 79 - 44 = 35$.
• Element: Bromine (Br, $Z = 35$).
• Number of Electrons: $35$ (neutral atom).
• Standard Notation: $\boldsymbol{^{79}_{35}\text{Br}}$.

9. Isotope with Mass 81, 46 Neutrons

• Atomic Number (Z): $81 - 46 = 35$.
• Element: Bromine (Br).
• Number of Electrons: $35$ (neutral atom).
• Standard Notation: $\boldsymbol{^{81}_{35}\text{Br}}$.

10. U-235 (Uranium-235)

• Atomic Number (Z): Uranium has $Z = 92$ (periodic table).
• Mass Number (A): $235$.
• Number of Neutrons: $235 - 92 = 143$.
• Number of Electrons: $92$ (neutral atom).
• Standard Notation: $\boldsymbol{^{235}_{92}\text{U}}$.

11. Isotope with Mass 204, 122 Neutrons

• Atomic Number (Z): $204 - 122 = 82$.
• Element: Lead (Pb, $Z = 82$).
• Number of Electrons: $82$ (neutral atom).
• Standard Notation: $\boldsymbol{^{204}_{82}\text{Pb}}$.

12. Isotope with Mass 204, 124 Neutrons

• Atomic Number (Z): $204 - 124 = 80$.
• Element: Mercury (Hg, $Z = 80$).
• Number of Electrons: $80$ (neutral atom).
• Standard Notation: $\boldsymbol{^{204}_{80}\text{Hg}}$.

13. Isotope with 76 Protons, 114 Neutrons

• Atomic Number (Z): $76$ (protons = Z).
• Mass Number (A): $76 + 114 = 190$.
• Element: Osmium (Os, $Z = 76$).
• Standard Notation: $\boldsymbol{^{190}_{76}\text{Os}}$.
• Number of Electrons: $76$ (neutral atom).

Filling the Table (Key Values):

Isotope	Notation Standard	Masse Atomique	Numéro Atomique	Nombre de Protons	Nombre de Neutrons	Nombre d’Électrons
C-14	$^{14}_6\text{C}$	14	6	6	8	6
Cl-37	$^{37}_{17}\text{Cl}$	37	17	17	20	17
Ni-58	$^{58}_{28}\text{Ni}$	58	28	28	30	28
Ni-60	$^{60}_{28}\text{Ni}$	60	28	28	32	28
Cu-65	$^{65}_{29}\text{Cu}$	65	29	29	36	29
Se-78	$^{78}_{34}\text{Se}$	78	34	34	44	34
Kr-86	$^{86}_{36}\text{Kr}$	86	36	36	50	36
Br-79	$^{79}_{35}\text{Br}$	79	35	35	44	35
Br-81	$^{81}_{35}\text{Br}$	81	35	35	46	35
U-235	$^{235}_{92}\text{U}$	235	92	92	143	92
Pb-204	$^{204}_{82}\text{Pb}$	204	82	82	122	82
Hg-204	$^{204}_{80}\text{Hg}$	204	80	80	124	80
Os-190	$^{190}_{76}\text{Os}$	190	76	76	114	76

(Note: The "message" likely involves interpreting the first letter of each isotope or a pattern, but the primary task is filling the table with atomic properties.)