科学の学習ルート
From one atom to the periodic table
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
参考資料
IUPAC · CIAAW 2024 · NIST · BIPM SI Brochure