Atomic Structure And Periodic Table Flashcards
(11 cards)
What is the radius of an atom
1 nano metre
What is a compound
Two or more different elements
Chemically joined together
What is a mixture
Two or more elements not chemically joined together
and can be easily separated
Eg salt water
How to collect salt from rock salt
Grind the rock
Add water and stir
Filter the mixture
Evaporate the salt water
You’ll be left with salt crystals
What group are halogens in
7
Why did scientists believe the plum pudding model
Lack of experimental knowledge
Why did Mendeleev leave gaps in the periodic table
He knew not all elements had been discovered yet due to their atomic weight and properties
What group are the alkali metals in
1
Properties of the halogens (group 7)
-reactivity deacreases down the group (outer shell electrons are further away so harder to attract another electron
Qualities of the noble gases
-very unreactive
-they exsist as a single atom (monatomic)
-low boiling point(increases down the group)
Properties of the alkali metals (group 1)
-react readily with water and chlorine
-reactivity increases down the group(outer electron gets further away from the nucleus there is less attraction to the postauve nucleus so it is easier to lose an electron)
