Electron configurations

Chemia IBPaper 2, maj 2026, TZ1wzorowane6 pktotwarteśrednie (szac.)

Zadanie 1f

Energy can also be produced by a hydrogen-oxygen fuel cell that uses an aqueous solution of sodium hydroxide as the electrolyte. Hydrogen gas is fed to the anode and oxygen gas to the cathode. (i) Deduce the half-equations for the electrode reactions in this…

Chemia IBPaper 2, maj 2026, TZ3wzorowane5 pktotwarteśrednie (szac.)

Zadanie 1a

(i) Magnesium burns in oxygen according to the equation $\ce{Mg(s) + 1/2 O2(g) -> MgO(s)}$. Explain, using electron configurations, how ions are formed by magnesium and oxygen and how these ions form a compound. (ii) Explain, using electron configurations, why…

Chemia IBPaper 2, maj 2026, TZ1wzorowane5 pktobliczenioweśrednie (szac.)

Zadanie 2a

(i) State the number of protons, electrons and neutrons in $\ce{^{85}Rb+}$. (ii) State the full electron configuration for $\ce{^{85}Rb+}$. (iii) The relative atomic mass, A_r, of Rb is 85.47. Determine the relative mass of the first isotope of Rb to four…

• Tabela do uzupełnienia

Chemia IBPaper 2, maj 2026, TZ1wzorowane5 pktotwarteśrednie (szac.)

Zadanie 2b

(i) Explain why Rb has a lower first ionization energy than strontium, Sr. (ii) Outline why Rb has a lower electronegativity than potassium, K. (iii) Explain why oxygen, O, has a lower first ionization energy than nitrogen, N.

Chemia IBPaper 1A, maj 2026, TZ3wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 2

Some successive ionization energies of an element are listed in the table. Which group of the periodic table contains this element? A. 14 B. 15 C. 16 D. 17

• Tabela do uzupełnienia

Chemia IBPaper 1A, maj 2026, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 3

What is the correct electron configuration of the selenium atom? A. 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁴ B. 1s²2s²2p⁶2d¹⁰3s²3p⁶4s²4p⁴ C. 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶ D. 1s²2s²2p⁶3s²3p⁶3d⁸4s²4p⁶

Chemia IBPaper 1A, maj 2026, TZ2wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 3

Which species has the ground state electron configuration [Ar] 3d⁸? A. Cu²⁺ B. Zn²⁺ C. Ni D. Ni²⁺

Chemia IBPaper 2, maj 2026, TZ2wzorowane8 pktotwarteśrednie (szac.)

Zadanie 3a

(i) Describe the structure of solid magnesium and state the forces that hold it together. (ii) Explain why a piece of magnesium can be hammered into a new shape without breaking. (iii) Explain why the melting point of magnesium is higher than that of sodium.…

Chemia IBPaper 1A, maj 2026, TZ3wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 3

Which statement about the visible line emission spectrum of atomic hydrogen is correct? A. The lines are equally spaced because the energy levels are equally spaced B. The lines get closer together towards longer wavelength because the energy levels converge…

Chemia IBPaper 2, maj 2026, TZ3wzorowane8 pktotwarteśrednie (szac.)

Zadanie 3b

(i) Outline why the strength of the metallic bond increases from potassium, K, to calcium, Ca. (ii) Write an equation for the reaction of potassium, K, with water, including state symbols. (iii) Outline why the electronegativity of chlorine is greater than…