level: The Periodic Table
Questions and Answers List
level questions: The Periodic Table
| Question | Answer |
|---|---|
| What did Dmitri Mendeleev do in his periodic table? | Publish his first book in 1869: - Arranged elements in terms of increasing atomic weight - took into account the properties of the elements and their compounds - left gaps for undiscovered elements - showed elements with similar chemical properties lined up in groups - swapped positions of some elements (eg, iodine & tellurium) due to similar chemical properties, despite their weight being in the wrong order |
| What are Periods in increasing order of? | Atomic Number |
| What do groups categorize elements in terms of? | Similar Properties |
| How can you tell if an element is a metal? | In chemical reactions metal atoms lose electrons to form positive ions. |
| What chemical properties indicate if an element is a non-/metal? | most metal oxides are basic most non-metal oxides are acidic |
| What physical properties indicate if an element is a non-/metal? | most metals have high melting and boiling points most non-metals have low melting and boiling points |