Periodic Table Flashcards
1
Q
Mendeleev
A
- Mendeleev arranged atoms by mass, now we arrange by atomic number
- Mendeleev used his table to predict properties, and spotted errors we can now explain
2
Q
Periods
A
Rows in the periodic table are called periods
3
Q
Groups
A
Columns in the periodic table are called groups
4
Q
Non-metals
A
Non-metals are found in the top right of the periodic table
5
Q
Electrons
A
Maximum electrons in shells is 2.8.8
6
Q
Group is found by…
A
The last number in the electron configuration tells you which group the element is in
E.g. 2.8.7 Is in group 7 because it has 7 electrons in its outer shell
7
Q
Group 1
A
Alkali metals - soft, low melting points. Have 1 electron in their outer shell
8
Q
Alkali metals
A
- Alkali metal + water —> __________hydroxide + hydrogen
- Alkali metals get more reactive as you go down the groups
- All fizz/float in water as go further down move more and give out more heat
- As you go down the outer electrons are further away from the nucleus so easier to remove
9
Q
Group 7
A
Group 7 - halogens. Have 7 electrons in their outer shell
10
Q
Test for chlorine
A
Damp blue litmus paper goes red then white
11
Q
Halogens
A
- Halogen + metal —> metal halide
- Halogens get less reactive as you down as it is harder to attract an extra electron
- Hydrogen + halogen —> hydrogen halide
- When hydrogen halides dissolve to form acids
12
Q
Group 0
A
Noble gasses have no reactions ‘inert’
Noble gasses have low density
