1- Atomic structure Flashcards
Paper 1
What is an atom’s radius
0.1nm/1x10^-10m
who discovered the atom
john dalton
who discovered the electron
JJ thompson
who discovered the nucleus
Rutherford
who discovered the shells
Neils Bohr
Are metals and non metals high/low in malleability
Metals are Malleable
Non-metals are brittle
crystallisation
removing a liquid leaving behind a solid
why does reactivity decrease as you go down group 7
halogens react by gaining 1 electron to fill their outer shells.
This gets harder down the group because the number of electron shells in each atom increases.
The outer shell therefore gets further away from the nucleus.
It becomes harder to gain an extra electron because it’s less attracted to the positive nucleus (electron shielding).
why does reactivity increase as you go down group 1
the number of electron shells in each atom increases.
As the number of shells increases, the outer electron gets further from the nucleus.
Its attraction to the nucleus decreases and it’s more easily lost.
