The Periodic Table Flashcards
(24 cards)
What was the original order that the periodic table was organised in?
In order of atomic weight.
What pattern did Newland’s see?
Every 8th element had similar properties
What were some problems with the original periodic table?
- Patterns didn’t always fit the properties
- 2 elements had to sometimes share a space
Who finalised the current periodic table?
Mendeleev
How did Mendeleev order the elements?
In order of atomic weight
How did Mendeleev make the elements fit into the table?
- He swaps some elements according to properties.
- He left gaps for undiscovered elements
The periodic table is organised into columns called…?
Groups
The periodic table is organised into rows called…?
Periods
What pattern connects the electron configuration to the periods?
Period number = number of electronic shells
How does the electronic configuration link to the groups?
Same number of electrons in their outer shell
Why do elements in the same group have similar chemical properties?
Only the outer shell are involved in chemical reactions
How is the Periodic Table of Elements organised?
1) Increasing atomic number
2) Elements in the same group have similar properties
3) Similar properties occur at regular intervals
What are Group 0?
The Noble Gases
What does inert mean?
Unreactive
Why are group 0 inert?
Because they already have a full outer shell of electrons
What are Group 1?
Alkali Metals
What is the general trend down group 1? (Boiling point and density)
Boiling point: Decreases
Density: Increases
What does the reactivity do down group 1?
Increase’s reactivity
What is the test for Hydrogen?
Squeaky-pop test
What gas is released during Group 1 reactions?
Hydrogen
What are Group 7?
The halogens
What are the colour trends down group 7?
Colour gets darker
What are the boiling point trends down group 7?
Boiling point increases
What is the reactivity trend down group 7
Reactivity decreases
