1. Starter Write these formulae: Calcium sulphate Sodium oxide
Magnesium phosphate
Complete these reactions:
Na2CO3 + HCl →
NH3 + HNO3 →
Student lead starter. Check HW

3. Atomic structure
L.O.:
Deduce the numbers of protons, neutrons and electrons in:
(i) an atom given its atomic and mass
number,
(ii) an ion given its atomic number, mass
number and ionic charge;
Explain the term isotopes.
45 min lesson
10.1 worksheet

4. Starter: remember everything you know about:
Proton Neutron Electron Nucleons
Recap previous knowledge

5. THE STRUCTURE OF ATOMS
Atoms consist of a number of fundamental particles,
the most important are ...
Mass / kg
Charge / C
PROTON
NEUTRON
ELECTRON

6. THE STRUCTURE OF ATOMS
Atoms consist of a number of fundamental particles,
the most important are ...
Mass / kg
Charge / C
PROTON
NEUTRON
ELECTRON
1.673 x 10-27
1.602 x 10-19
1.675 x 10-27
9.109 x 10-31
1.602 x 10-19

7. THE STRUCTURE OF ATOMS
Atoms consist of a number of fundamental particles,
the most important are ...
Mass / kg
Charge / C
Relative mass
Relative charge
PROTON
NEUTRON
ELECTRON 1
1.673 x 10-27
1.602 x 10-19 1
1.675 x 10-27 1
1840
9.109 x 10-31
1.602 x 10-19
Calculate the mass of a carbon-12 atom; it has 6 protons, 6 neutrons and 6 electrons

8. 1 +1 1 -1 THE STRUCTURE OF ATOMS
Atoms consist of a number of fundamental particles,
the most important are ...
Mass / kg
Charge / C
Relative mass
Relative charge
PROTON
NEUTRON
ELECTRON 1 +1
1.673 x 10-27
1.602 x 10-19 1
1.675 x 10-27 1
1840 -1
9.109 x 10-31
1.602 x 10-19

9. MASS NUMBER AND ATOMIC NUMBER
Atomic Number (Z) Number of protons in the nucleus of an atom
Mass Number (A) Sum of the protons and neutrons in the nucleus

10. MASS NUMBER AND ATOMIC NUMBER
Atomic Number (Z) Number of protons in the nucleus of an atom
Mass Number (A) Sum of the protons and neutrons in the nucleus
Mass Number (A)
PROTONS + NEUTRONS Na 23 11
Atomic Number (Z)
PROTONS

11. Na 23 11 MASS NUMBER AND ATOMIC NUMBER
Atomic Number (Z) Number of protons in the nucleus of an atom
Mass Number (A) Sum of the protons and neutrons in the nucleus
Mass Number (A)
PROTONS + NEUTRONS Na 23 11
THESE ALWAYS GO TOGETHER – ANYTHING WITH 11 PROTONS MUST BE SODIUM
Atomic Number (Z)
PROTONS

12. Na 23 11
How many neutrons in 23Na?
23 – 11 = 12

13. Which picture is incorrect?
Carbon-14 dating

14. Isotopes
Every single atom of any particular element has the same number of protons in its nucleus, but the number of neutrons may vary.
Atoms with the same number of protons but different numbers of neutrons are called isotopes.
Write definition
Different isotopes of the same element react chemically in exactly the same way.

15. Isotopes are atoms of the same element with different numbers of neutrons.

16. Exercise 10.1
Isotopes worksheet

17. Answer the following questions by using one or more of the following terms: protons, neutrons, electrons.
Which are nucleons?
Which have the same mass?
Which have opposite charges?
Which has/have no charge?
Which is found outside the nucleus?

18. Atomic structure
L.O.:
Deduce the numbers of protons, neutrons and electrons in:
(i) an atom given its atomic and mass
number,
(ii) an ion given its atomic number, mass
number and ionic charge;
Explain the term isotopes.