Section 4.3 Lecture for Honors & Prep Chemistry

1. 10/2- Bellwork
Fill in the chart
Subatomic Location Charge Mass
particle (in or out
of nucleus)
Proton
Neutron
Electron

2. Elements are different because
they contain different numbers
of protons.
The atomic number of an
element is the number of protons
in the nucleus.

4. For neutral atoms PROTONS = ELECTRONS

5. ISOTOPES-Atoms with the same
number of protons, but different
numbers of neutrons

6. ISOTOPES-Atoms with the same
number of protons, but different
numbers of neutrons
They are still the same element, but they
have different weights because they
have different numbers of neutrons.

7. The number of protons plus
neutrons in an atom is called the
mass number.

8. The number of protons plus
neutrons in an atom is called the
mass number.
Isotopes are identified by their
mass numbers.
Mass number
Iodine-131 or
131
53 I
atomic
number

9. Isotopes of an element will have the same
_____________ but different ____________.

10. Isotopes of an element will have the same
_____________ but different ____________.
atomic number

11. Isotopes of an element will have the same
_____________ but different ____________.
atomic number mass numbers

12. Isotopes are chemically alike
because they have identical
numbers of protons and electrons.

13. Au is the chemical symbol for gold.

14. Au is the chemical symbol for gold.
protons +
neutrons

15. Au is the chemical symbol for gold.
protons +
neutrons
protons

16. Au is the chemical symbol for gold.
protons +
neutrons
protons

17. Au is the chemical symbol for gold.
protons +
neutrons
118 protons

18. Au is the chemical symbol for gold.
protons +
neutrons
118 protons
neutrons

19. 4.1

20. for Sample Problem 4.1

22. for Conceptual Problem 4.2

24. The atomic mass of an element
is a weighted average, which
accounts for how much of each
isotope occurs naturally.

25. The atomic mass of an element
is a weighted average, which
accounts for how much of each
isotope occurs naturally.

26. 4.3
Some Elements and Their Isotopes

30. for Conceptual Problem 4.3
for Conceptual Problem 4.3

31. The periodic table arranges
elements into groups based on
a set of repeating properties.

32. •Each horizontal row of the
periodic table is called a period.
• Within a given period, the properties of the
elements vary as you move across it from
element to element.
• At the end of a sentence, written horizontally, is a period.

33. 4.3 The Periodic Table—A Preview
A Period

34. 4.3 The Periodic Table—A Preview
A Period

36. •Each vertical column of the
periodic table is called a
group, or family.

37. •Each vertical column of the
periodic table is called a
group, or family.
•Elements within a group have
similar chemical and physical
properties.

38. 4.3 The Periodic Table—A Preview
A Group or Family

39. 4.3 The Periodic Table—A Preview
A Group or Family

40. 4.3 Section Quiz
1. Isotopes of an element have
a. the same mass number.
b. different atomic numbers.
c. the same number of protons but different
numbers of neutrons.
d. the same number of protons but different
numbers of electrons.

41. 4.3 Section Quiz
1. Isotopes of an element have
a. the same mass number.
b. different atomic numbers.
c. the same number of protons but different
numbers of neutrons.
d. the same number of protons but different
numbers of electrons.

42. 4.3 Section Quiz
2. How many neutrons are in sulfur-33?
a. 16 neutrons
b. 33 neutrons
c. 17 neutrons
d. 32.06 neutrons

43. 4.3 Section Quiz
2. How many neutrons are in sulfur-33?
a. 16 neutrons
b. 33 neutrons
c. 17 neutrons
d. 32.06 neutrons