Printable worksheet ยท 3 of 4
Outer electrons help explain group behaviour - Paper 3
Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.
Read before answering
Early-element shell model: neutral potassium has 19 protons and electron arrangement 2,8,8,1. Model ion formation by losing 1 electron(s). Shell entries count electrons; they are not literal circular tracks. Proton number is unchanged.
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