PPT on Atomic Structure

1. All About Atoms
Q2, W1

2. Chemistry
The study of the composition of
matter and the changes that
matter undergoes.

3. Created by G.Baker www.thesciencequeen.net
•Matter is anything that takes up
space and has mass.
•All matter is made of atoms
•Atoms are the building blocks of
matter, sort of how bricks are
the building blocks of houses.

5. Atom
Atom
– smallest particle of
an element that can
exist alone

6. Structure of the Atom
Two regions of an atom
•Nucleus
Center of atom
Protons and neutrons
•Electron “cloud”
Area surrounding nucleus
containing electrons

8. No charge or 0
+
-

9. Subatomic Particles
Particle Symbol Charge Relative Mass
e- -1 1/1840
p+ +1 1
1
0
n
Electron
Proton
Neutron

10. Counting Atoms
Atomic Number
•Number of protons in nucleus
•The number of protons
determines identity of the
element!!

13. •Mass Number (Atomic Mass)
•Number of protons + neutrons
•Units are g/mol

14. Isotopes
•Atoms of the same element with
varying number of neutrons
•Different isotopes have different
mass numbers because the
number of neutrons is different

15. Ions- is a charged atom or molecule. It is
charged because the number of electrons do
not equal the number of protons in the atom
or molecule.
Cation = a positive ion Anion = a negative ion

16. •Nuclear Symbol Notation

17. •Mass Number = # protons + # neutron
•# of electron = # protons = atomic number
•Neutron= mass number- # of proton

18. Let’s Practice
Aluminum (Al) (no periodic table)
•Protons = 13
•Electrons =
•Neutrons = 14
•Atomic Number =
•Atomic Mass =

19. Let’s Practice w/ nuclear symbol notation
•Nuclear Symbol notation (no periodic table)
•Protons =
•Electrons =
•Neutrons =
•Atomic Number =
•Atomic Mass =
108
47

20. Let’s Practice w/ isotopes
•use the periodic table
•Protons =
•Electrons =
•Neutrons =
•Atomic Number =
•Atomic Mass =
Uranium-235

21. Let’s Practice with Ions
Use the periodic table
•Charge =
•Protons =
•Electrons =
•Neutrons =
•Atomic Number =
•Atomic Mass =
K
39 1+