Содержание
- 2. Reading the Periodic Table
- 3. What is the Periodic Table? It is an organizational system for elements.
- 4. Who created it? The quest for a systematic arrangement of the elements started with the discovery
- 5. Periods = Rows 一排 The horizontal rows of the periodic table are called periods. Elements in
- 6. Periods = Rows Atomic mass increases from left to right across a period. Metals are on
- 7. Groups = Columns縱列 The vertical columns of the periodic table are called groups. Elements in the
- 8. What do all the numbers mean?
- 11. Other than periods and groups, the table is divided into families
- 12. Hydrogen Hydrogen belongs to a family of its own. Hydrogen is a diatomic (H2), reactive gas.
- 13. Alkali metals 1st column on the periodic table (Group 1) not including hydrogen. Their low ionization
- 14. Alkaline earth metals Second column on the periodic table (Group 2). They are very reactive metals,
- 15. Transition metals The transition elements are located in groups IB to VIIIB of the periodic table.
- 16. Rare earth elements The rare earth metals are found in group 3 of the periodic table,
- 17. Other than periods and groups, the table is divided into families
- 18. Other metals They are usually in form of solid and have a high density.
- 19. The electronegativities and ionization energies of the metalloids are between those of the metals and nonmetals,
- 20. The nonmetals are located on the upper right side of the periodic table. Nonmetals have high
- 21. The halogens are located in Group VIIA of the periodic table, and are a particular class
- 22. The noble gases, also known as the inert gases, are located in Group VIII of the
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