Electron configurations

Chemia IBPaper 2, maj 2026, TZ1wzorowane4 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 1A, maj 2026, TZ1wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 2

What is the maximum number of electrons that can occupy the 3rd main energy level in an atom? A. 6 B. 9 C. 18 D. 32

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

Zadanie 4

Which main energy level can hold a maximum of 50 electrons? A. n = 5 B. n = 4 C. n = 6 D. n = 25

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

Zadanie 11

The diagram shows an outline of the periodic table with four regions labelled A, B, C and D. An element has the ground state electron configuration [Ar] 3d⁷ 4s². In which region is it found? A. Region A B. Region B C. Region C D. Region D

• Materiał graficzny

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

Zadanie 12

Which of these could be the ground-state electron configuration of an atom of a d block element? A. [Ar] 4s² 3d¹⁰ 4p¹ B. [Ne] 3s² 3d⁶ C. [Ar] 4s² 3d⁶ D. [Ar] 4s² 4p⁶