Question

chemactivity 1 what makes an atom? 11. complete the following table. isotope atomic number z mass number a number of electrons 59co²⁺ 27 59 25 14n 7 14 7 14 3 7 3 14 3 6 3 58zn²⁺ 19f⁻

Explanation:

Step1: Recall atomic number and mass number relationships

The atomic number (Z) is the number of protons in an atom. For a neutral atom, the number of electrons equals the number of protons. For ions, the number of electrons is adjusted based on the charge. The mass number (A) is the sum of protons and neutrons.

Step2: Analyze \(^{59}Co^{2 +}\)

The atomic number of Co (cobalt) is 27. Given the ion \(^{59}Co^{2+}\), the mass number A = 59. Since it has a 2+ charge, the number of electrons is 27 - 2=25.

Step3: Analyze \(^{14}N\)

The atomic number of N (nitrogen) is 7. For \(^{14}N\), the mass number A = 14. In a neutral nitrogen - 14 atom, the number of electrons is equal to the atomic number, so it has 7 electrons.

Step4: Analyze an atom with Z = 3

The element with atomic number Z = 3 is lithium (Li). If the mass number A = 7, for a neutral atom, the number of electrons is equal to the atomic number, so it has 3 electrons.

Step5: Analyze an atom with Z = 3 and A = 6

The element with Z = 3 is lithium. For a neutral atom, the number of electrons is 3.

Step6: Analyze \(^{58}Zn^{2+}\)

The atomic number of Zn (zinc) is 30. For \(^{58}Zn^{2+}\), the mass number A = 58. Since it has a 2+ charge, the number of electrons is 30 - 2 = 28.

Step7: Analyze \(^{19}F^{-}\)

The atomic number of F (fluorine) is 9. For \(^{19}F^{-}\), the mass number A = 19. Since it has a 1 - charge, the number of electrons is 9+1 = 10.

Isotope	Atomic Number (Z)	Mass Number (A)	Number of Electrons
\(^{14}N\)	7	14	7
\(^{7}Li\)	3	7	3
\(^{6}Li\)	3	6	3
\(^{58}Zn^{2+}\)	30	58	28
\(^{19}F^{-}\)	9	19	10

Answer:

Isotope	Atomic Number (Z)	Mass Number (A)	Number of Electrons
\(^{14}N\)	7	14	7
\(^{7}Li\)	3	7	3
\(^{6}Li\)	3	6	3
\(^{58}Zn^{2+}\)	30	58	28
\(^{19}F^{-}\)	9	19	10