DP Chemistry (first assessment 2025)
Question 19M.1A.HL.TZ1.5
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.HL.TZ1.5 |
| Level | HL | Paper | 1A | Time zone | TZ1 |
| Command term | Question number | 5 | Adapted from | N/A |
5.
[Maximum mark: 1]
19M.1A.HL.TZ1.5
Which element is represented by the first eight successive ionization energies on the graph?
A. Mg
B. S
C. Cl
D. Ar
[1]
Markscheme
B
Examiners report
52 % of candidates could identify the element for successive ionization energies with no clear misconception based on the other choices.
Syllabus sections
Structure 1. Models of the particulate nature of matter » Structure 1.3—Electron configurations » Structure 1.3.6—In an emission spectrum, the limit of convergence at higher frequency corresponds to ionization. Explain the trends and discontinuities in first ionization energy (IE) across a period and down a group. Calculate the value of the first IE from spectral data that gives the wavelength or frequency of the convergence limit.