How did _______________ organize the elements in his periodic table?

1. Mendeleev’s Periodic Table • How did _______________ organize the elements in his periodic table?

2. Mendeleev’s Periodic Table • ___________________ arranged the elements into rows in order of increasing mass so that elements with similar _________________ were in the same column.

3. Mendeleev’s Periodic Table • Mendeleev’s ________________ In the 1860s, Dmitri Mendeleev developed an approach for organizing the elements while playing the card game solitaire. In this game, the player sorts a deck of cards by suit and value.

4. Mendeleev’s Periodic Table • Mendeleev made a “deck of cards” of the elements, listing an element’s name, mass, and properties on each card. When Mendeleev lined up the cards in order of increasing mass, a _________________ emerged. The key was to break the elements into rows.

5. Mendeleev’s Periodic Table • The final arrangement was similar to a winning arrangement in solitaire, except that the columns were organized by properties instead of suits. Within a column, the masses increased from top to bottom. • Mendeleev’s chart was a periodic table. A _________________________is an arrangement of elements in columns, based on a set of properties that repeat from row to row.

6. Mendeleev’s Periodic Table • Mendeleev’s Prediction At the time Mendeleev made his table, many elements had not yet been _______________. When he placed the elements where their properties fit, there were several gaps in the table. Mendeleev was able to offer the best explanation for how the properties of an element were related to its location in his table.

7. Mendeleev’s Periodic Table • Mendeleev was confident that the gaps in his table would be filled by new elements. He used the __________________________ of elements located near the blank spaces in his table to _______________ properties for undiscovered elements. • Some scientists didn’t accept those predictions. Others used the predictions to help in their search for ______________________ elements.

8. Mendeleev’s Periodic Table Evidence Supporting Mendeleev’s Table • What ____________________ helped verify the usefulness of Mendeleev’s table?

9. Mendeleev’s Periodic Table • The close match between Mendeleev’s ____________________ and the actual ____________________ of new elements showed how useful his periodic table could be.

10. Mendeleev’s Periodic Table • Scientists use the periodic table to explain the chemical behavior of different groups of elements. • The properties of gallium are remarkably similar to the _________________ properties of eka-aluminum. Scientists concluded that gallium and eka-aluminum are the same element. • The discovery of scandium (Sc) in 1879 and the discovery of germanium (Ge) in 1886 _______________ more evidence.

11. Assessment Questions • In Mendeleev’s periodic table, elements with similar properties were grouped • in the same row. • in the same column. • in diagonal lines that run from top left to the bottom right. • in pairs of two.

12. Assessment Questions • For which element did Mendeleev correctly predict the properties even before it had been discovered? • gallium • hydrogen • bromine • aluminum