C2 Flashcards
How were the element arranged in the early period table
Arranged by atomic weight
Who proposed law of octaves
Newlands
What does law of octaves suggest
Properties of every eighth element were similar
What does the group number on the periodic table equal
Number of electrons on outer shell
Give the properties of alkalis metals
Reactive
Soft
Low density
Low melting point
What do the melting and boiling points do as you go down group 1
Decrease
Why does the reactivity of the alkalis metals increase going down the group
the atoms get larger so the outer electron gets further from the nucleus, the electrostatic attraction decreases due to the shielding of inner shells
What group is the halogens part of
Group 7
What are the halogens
Non metals
What are the melting and boiling points like in the halogens
Low that increase going down the group
What do halogens easily form
Covalent compounds
Do the halogens conduct electricity
Poor conductors
What does the reactivity do going down the halogens
Decrease
Why does the reactivity decrease going down the halogens
The outer electron gets further away from the positive nucleus so the force needed to pull another electron in gets weaker
Why does the reactivity of metals increase going down the group
When metals react they lose electrons
