1. Atomic Structure

3. Overview of topic Atomic Structure Ions
Electronic Structure and the Periodic Table
Structure of Atoms
Atomic Structure
Electronic Arrangement
Isotopes

4. Today’s Menu What is an atom Structure of an atom
Relative charges and approximate
relative masses of proton, neutron and an electron
Symbol of an atom
Proton number, nucleon number

5. What is an atom?

6. What is an atom All matters are made up of atoms
Atoms are extremely small in size

7. What is an atom
Picture of lithium atoms in the compound lithium cobalt oxide
Taken with a transmission electron microscope, which can magnify objects up to 500,0000 times

8. What is an atom An atom consists of 3 subatomic particles: Protons
Neutrons
Electrons
Atom is a particle which is electrically neutral
No. of protons = No. of electrons

9. Structure of an Atom

10. Structure of an Atom
Protons and Neutrons +
Electrons
Nucleus
Shells

11. Structure of an Atom
Shells

12. Structure of an Atom
Shells
Electrons

13. Structure of an Atom
Protons and Neutrons +
Electrons
Nucleus
Shells

14. Structure of an Atom

15. Relative charges and approximate relative masses

16. Particle
Charge
Relative Mass
Remarks
Proton
(p) +1 1
Mass is the same as that of a hydrogen atom
Found in the nucleus of the atom
Neutron
(n)
Electron
(e-) -1
1/1840
(negligible)
One hydrogen atom weighs as much as 1836 electrons
Found around the nucleus.

17. Symbol of an atom

19. Symbol of an atom
Chemical Symbol
Nucleon Number
Proton Number
E.g.

20. Proton number, nucleon number

21. Proton number Proton number (atomic number)
The number of protons in an
atom
For an atom,
no. of protons = no. electrons

22. Nucleon number Nucleon number (mass number)
= no. of protons + no. neutrons
No. of Neutrons
= Nucleon number – Proton number

23. Example Given , (a) What is the proton number? Ans: 29
What is the number of electrons in Cu atom?
Ans: 29
(c) What is the nucleon number?
Ans: 64
(d) What is the number of neutrons?
Ans: 64-29=53

24. Summary

25. Summary Structure of an atom
Relative charges and approximate relative masses of protons, neutrons and electrons +
Electrons
Nucleus
Protons and Neutrons

26. Summary Symbol of an atom Proton number, nucleon number Nucleon Number
Chemical Symbol
Nucleon Number
Proton Number

27. Any Questions