iGCSE Chemistry (0620) Core:8.1 Arrangement of elements: Exam Style Questions Paper 1- New Syllabus
▶️ Answer/Explanation
Detailed solution:
Metallic character decreases as you move from left to right across a period and increases as you move down a group. In the section of the Periodic Table shown, the element located furthest to the left and lowest down will have the most pronounced metallic properties. Based on the diagram, sodium (Na) in Group I, Period 3 is the element that best fits this description among the highlighted elements.
▶️ Answer/Explanation
Detailed solution:
Elements in the same group have the same number of outer shell electrons, not the same full electronic configuration, so A is not correct. Metallic character actually decreases from left to right across a period, making C false. The Periodic Table is arranged by increasing proton number, not nucleon number, so D is also wrong. Option B is correct: Group VII elements have 7 outer electrons, and to get a full shell of 8 they need to gain one electron, forming an ion with a 1- charge. The maths is 7 minus 8, which equals -1.
▶️ Answer/Explanation
Detailed solution:
As you move from left to right across a period, elements change from metallic to non-metallic. This means metallic character decreases. On the left, you have reactive metals; on the right, you find non-metals. For example, in period 3, sodium (metal) is on the left, chlorine (non-metal) is on the right.