Atomic Structure – Lecture Notes Summary

Contain protons , neutrons ,
electrons
-

these are subatomic particles
.



Particle Mass charge
Proton # #1

Neutron 1 g

electron almost ! I
atanic
-




-
Nucleus : 29
4) middle of atan
K
2) contains protons and neutrons
63
3) positive charge because of protons ↑
mass
Electrons :
1) more around nucleus in shells
2) I max elections on first shell ,
8 mat on end
,
8 max on 3rd.

Number of
elections = number of protons
1) neutral atoms have no
charge
2) If electrons are added or removed, atom
becomes charged and is then an ion
.



Atomic I and mass number :
1) atanic number = proton number
2) atoms of same element have same
number of protons.
3) mass number
= neutrons + protons