Mendeleev
Periodic table · chemistry · physics
科学の学習ルート

原子の構造

Carbon-12 has 6 protons and 6 neutrons; changing the proton count would create a different element.

ここから始める

Carbon-12 has 6 protons and 6 neutrons; changing the proton count would create a different element.

考えをつなぐ

1

Carbon-12 has 6 protons and 6 neutrons; changing the proton count would create a different element.

2

Sodium has 11 electrons; its outer 3s electron helps explain why sodium readily forms Na+.

3

Across period 3, atomic size generally falls while first ionization energy generally rises, with instructive exceptions.

具体的な確認点

The periodic table is a map of repeating electron structures. Moving across a row changes nuclear charge and electron arrangement together, producing trends—and useful exceptions.

さらに深く

Atomic Structure · Electron Configuration · Periodic Trends

参考資料

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Take one idea at a time. If a new word appears, connect it to a concrete object, number or experiment before moving on.

Start with the central idea, then test it against a concrete element or example. A scientific model is useful when we know what it explains — and where its limits are.

原子の構造