The Periodic Table Flashcards
Why was it called Newlands’ Law of Octaves?
The properties of elements repeated every eight elements
Why did no one take on board The Law of Octaves?
1) groups contained metals w/o similar properties
2) no gaps
3) mixed up metals and non metals
What order did Mendeleev put the elements in?
Order of increasing atomic mass
Why did people take on board Mendeleev’s table?
He left gaps and predicted element’s properties. They were correct predictions.
How are the elements ordered in the modern periodic table?
Order of increasing atomic number
What are group one elements?
Alkali metals
Are all group one elements metal?
Yes
What charge do alkali metals gain?
1+
How do alkali metals react with water?
Violently
What happens to the reactivity of alkali metals as you go down the group?
Increases
Is hydrogen in group one?
No
Are alkali metals hard or soft?
Soft
Are transition metals hard or soft?
Hard
What are transition metals used as?
Catalysts
At what speed do transition metals react with water and air?
Slowly
