Question

two main - group elements are highlighted in the outline of the periodic table below: what can you say about these elements without knowing exactly which they are? use that kn important: do not try to figure out exactly which elements are marked, and then use your knc to. you will also be marked wrong for any answer, correct or not, that cant be determined fror

Explanation:

• Conductivity in solid state: Metals are good conductors of electricity. Element \(X\) is likely a metal (left - side of the periodic table, main - group metals are on the left), while \(Y\) is likely a non - metal (right - side of the periodic table). Metals have delocalized electrons that can move freely and conduct electricity. So, element \(X\) (metal) probably conducts electricity better in the solid state.
• Flame color in gas phase: Metal ions (from metals like those where \(X\) is located) can produce colored flames. Non - metals (where \(Y\) is located) do not typically produce such colored flames in the gas phase. So, element \(X\) is more likely to glow green or yellow in a flame.
• Heat conductivity in solid state: Metals (\(X\)) are good conductors of heat (due to delocalized electrons facilitating heat transfer), while non - metals (\(Y\)) are poor conductors of heat. So, element \(Y\) probably conducts heat less effectively.

Answer:

1. Element \(X\)
2. Element \(X\)
3. Element \(Y\)