Based on the periodic trends of Group 1 elements, which of the following temperatures is most likely to be the melting point of rubidium (Rb\text{Rb}Rb), given that sodium (Na\text{Na}Na) melts at 98∘C98^\circ\text{C}98∘C and potassium (K\text{K}K) melts at 63∘C63^\circ\text{C}63∘C?
390∘C390^\circ\text{C}390∘C
39∘C39^\circ\text{C}39∘C
3.9∘C3.9^\circ\text{C}3.9∘C
−39∘C-39^\circ\text{C}−39∘C
Practise Edexcel GCSE Chemistry Group 1 with exam-style questions for Foundation and Higher tier. 51 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
