Explore 118 elements, source atomic weights, electron configurations, comparisons and original element quizzes.
Useful to know
Can this answer every science question?
No. Each model has stated limits. Use structured fields when a prose question is unsupported. It does not predict reaction products or provide experiment procedures.
Are these official curriculum mappings?
No. These are concept-based resources. KICD and legacy KCSE mappings remain under review; no endorsement is claimed.
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Science learning notes
Read an element, then explain its place
Atomic number counts protons. A neutral atom has the same number of electrons. Isotopes have the same proton count but different neutron counts. A standard atomic weight describes normal materials, often as an interval; it is not an isotope mass number.
Example: Sodium has 11 protons. A neutral atom has 11 electrons; Na⁺ has 10.
Common mistake: Rounding an atomic weight does not identify an isotope or its neutron count.
Are the rings electron orbits?
No. The shell diagram is a simplified counting model. Quantum orbitals describe distributions, not circular paths.
Concept-based learning; formal curriculum mappings remain under review. No KICD endorsement is claimed.