11 markeasy
The Period 2 element with the highest melting temperature is
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aluminium
boron
carbon
silicon
Chemistry
The Periodic Table — Multiple-Choice Questions (Edexcel IAL Chemistry): Exam Questions
Exam code:YCH113 questions · 5 marks · ≈ 5 min
21 markmedium
In which series are the elements in order of increasing melting temperature?
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I2 < Br2 < Cl2 < F2
Li < Be < B < C
Li < Na < K < Rb
Si < P < S < Cl
33 marksmedium
The graph shows the first ionisation energies of the elements in Period 3, labelled A to H in order of increasing atomic number.
Element X has the electronic configuration [Ne] 3s2 3p2.
Which letter on the graph labels element X?
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C
D
E
F
The first ionisation energy of element C is lower than that of element B. What is the reason for this?
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Element C's outermost electron is paired
Element C has fewer protons than element B
Element C has more outer-shell electrons than element B, increasing electron–electron repulsion
Element C's outermost electron occupies a 3p sub-shell, which is at a higher energy and more shielded than the 3s sub-shell holding element B's outermost electron
The first ionisation energy of element F is lower than that of element E. What is the reason for this?
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Element F has more shielding than element E
Element F has a larger atomic radius than element E
Element F's outermost electron is in a higher-energy sub-shell than element E's
Element F has 3p4 with one paired orbital — the spin-pair repulsion makes one of the paired electrons easier to remove than an electron from element E's 3p3