The Structure of the Atom: Mechanism

≈ 25 min

Mechanism

Follow the mechanism step by step and distinguish what causes the change from what is merely observed.

This extension applies that lens specifically to The Structure of the Atom.

Every atom is built from three subatomic particles:

Particle	Charge	Relative mass	Location
Proton	$+1$	1	nucleus
Neutron	$0$	1	nucleus
Electron	$-1$	≈ 0 (about 1/1836)	orbits the nucleus

The nucleus is a tiny, dense core of protons and neutrons holding almost all the mass. Electrons move in the space around it in energy levels (shells). A neutral atom has equal numbers of protons and electrons, so the $+$ and $-$ charges cancel.

Chemistry — Grade 10 — Mechanism: Which particle carries a negative charge?

Proton

Neutron

Electron

Nucleus

Chemistry — Grade 10 — Mechanism: A neutral atom has 11 protons. How many electrons does it have?

Chemistry — Grade 10 — Mechanism: In which part of the atom are the protons and neutrons found? (one word)

Name the original topic being extended by this mechanism lesson.

Which statement is the best evidence-led starting point for The Structure of the Atom: Mechanism?

Every atom is built from three subatomic particles: | Particle | Charge | Relative mass | Location | |---|---|---|---| | Proton | $+1$ | 1 | nucleus | | Neutron | $0$ | 1 | nucleus | | Electron | $-1$ | ≈ 0 (about 1/1836) | orbits the nucleus | The nucleus is a tiny, dense core of protons and neutrons holding almost all the mass. Electrons move i

Pure Substances and Mixtures

Elements and Compounds

A conclusion needs no observations, calculations or stated assumptions.