The periodic table: the map of elements

📖 Lesson ──▶ 🎯 Quiz — pick the translation ──▶ ✅ Lesson done

Everything is built from ~118 elements — like words from letters. Mendeleev arranged them in a table: rows are periods, columns groups with similar character. Noble gases on the right are lazy and react with no one; metals on the left give electrons and flare up. The atomic number equals the proton count.

●H (1) — hydrogen, the lightest
●Fe (26) — iron, Au (79) — gold
●Groups are families: Li, Na, K — all reactive metals

🧪 Mendeleev saw the table in a dream — and left empty cells for undiscovered elements. They were found later exactly there.

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Test yourself!

Practice the topic with the trainer — like after class

Quiz — pick the translation → 🖨 Worksheet

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