Online worksheet · 4 of 4

Protons identify the element - Online practice 4

Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.

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Particle card: atomic number Z=12, mass number A=24, charge +2. Protons identify the element; A counts protons plus neutrons. Charge in these units is protons minus electrons. A second isotope has the same Z but mass number 25. These are counting models, not diagrams to scale.

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