DP Chemistry (first assessment 2025)
Question 19M.1A.SL.TZ2.9
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.SL.TZ2.9 |
| Level | SL | Paper | 1A | Time zone | TZ2 |
| Command term | Question number | 9 | Adapted from | N/A |
9.
[Maximum mark: 1]
19M.1A.SL.TZ2.9
How does a lithium atom form the most stable ion?
A. The atom gains a proton to form a positive ion.
B. The atom loses a proton to form a negative ion.
C. The atom loses an electron to form a positive ion.
D. The atom gains an electron to form a negative ion.
[1]
Markscheme
C
Examiners report
One of the most straight-forward questions on the paper about how lithium forms its most stable ion.
Syllabus sections
Structure 2. Models of bonding and structure » Structure 2.1—The ionic model » Structure 2.1.1—When metal atoms lose electrons, they form positive ions called cations. When non-metal atoms gain electrons, they form negative ions called anions. Predict the charge of an ion from the electron configuration of the atom.