Identify atomic particles

Supplied materials

• All measurements and observations below are supplied classroom examples. They are not data from actual learners or a claim about a particular real site.
• Paper or a browser document for a labeled drawing, table or explanation.
• Worked problem inputs: One atom has 11 protons, 12 neutrons and 10 electrons. Explain identity and charge separately.
• Assessment case 1: A model atom gains one electron while its proton count stays 9. What changes? Which inference or prediction is best supported?
• Assessment case 2: Which scientific label fits the specifically described step or feature? Supplied case: Neutral particle in center.
• Assessment case 3: Which scientific label fits the specifically described step or feature? Supplied case: Negative particle outside center.
• Assessment case 4: Which scientific label fits the specifically described step or feature? Supplied case: Region containing nuclear particles.
• Assessment case 5: Which scientific label fits the specifically described step or feature? Supplied case: Particle count sets atomic number.
• Assessment case 6: A neutral atom gains two electrons without changing its nucleus. What net charge follows? Which inference or prediction is best supported?

Learn the idea

An atom contains protons and neutrons in its nucleus and electrons described by quantum distributions around it. Element identity is determined by proton number, not by neutron or electron count alone.

Proton means positive nuclear particle determining element identity. Neutron means neutral nuclear particle affecting isotope mass. Electron means negative particle outside nucleus. Nucleus means compact central region containing protons and neutrons.

For the supplied mechanism problem, One atom has 11 protons, 12 neutrons and 10 electrons. Explain identity and charge separately. Eleven protons determine the element. Neutrons affect isotope mass; ten electrons against eleven protons yield net charge +1. Electron loss does not change element identity.

1. Read the supplied problem and mark the structures, processes or quantities named: One atom has 11 protons, 12 neutrons and 10 electrons. Explain identity and charge separately.
2. Draw the relevant boundary, pathway or comparison and label it using the scientific ideas above.
3. Write a causal explanation or calculation, showing how each observation supports the result.
4. Compare your reasoning with the worked solution; name a condition that would change or limit the inference.

Check your reasoning

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Take it further

New particle has 8 protons, 10 neutrons and 10 electrons. Expected: oxygen identity, mass number 18 and net charge -2; proton count sets identity while electron imbalance sets charge.

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