Classification of elements in the periodic tableAQA A-Level Chemistry: Mind map

Exam questions on Classification of elements in the periodic table

1. A student classifies elements using only their proton numbers and a periodic table. The elements are sodium (11), iron (26), arsenic (33) and terbium (65).
   Explain why the block that an element belongs to is determined by its proton number.2 marks
2. The electron configurations of four unnamed elements are: W 1s²2s²2p⁶3s²; X 1s²2s²2p⁶3s²3p⁶3d⁵4s²; Y 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁵; Z [Xe]4f⁷6s².
   Deduce the block of elements Y and Z. Give a reason for each answer.2 marks
3. A data card for a periodic table quiz gives three elements by proton number only: 38, 22 and 34.
   Use the Periodic Table to identify the block (s, p, d or f) in which each of these three elements is found.3 marks