Question | Answer |
What are Aristotle's 4 "elements"? | Air, Fire, Earth, Water |
When did Alchemy become a real science? | In the 17th and 18th centuries |
What are the Diatomic Elements? | H2, N2, O2, F2, Cl2, Br2, I2 |
What did Dmitri Mendeleev do? | Arranged the elements into what eventually became the periodic table |
What is the repetition of certain properties at regular intervals when elements were placed in order of atomic mass? | Periodicity |
Who arranged the elements in the table in order of their increasing atomic masses? | John Newlands |
What are metals? | Valence electrons that are not held very strongly and are easily removed |
What are non metals? | They hold their electrons tightly, so their properties are very different from metals |
What are horizontal rows of the periodic table called? | Periods or Series |
What do the period number tell? | How many energy levels the element in that period have in their ground state |
What is electron affinity? | Deals with the strength of attraction of electrons to unbounded atoms |
Covalent bonds | Non metal/ non metal- sharing electrons |
Ionic bonds | Metal/ non metal- giving away and taking electrons |
Metallic bonds | Metal/ Metal- everyone shares the electrons |