Henry Mosely
What are the three sub-
atomic particles of the
atom?
How do you call the
positively charged
particles?
How do you call the
negatively charged
particles?
The particles that were last to
be discovered because it is
uncharged.
LET’S ENTER THE
INVISIBLE WORLD !!
How do we
determine the
number of
protons, neutron
and electrons?
The Helium Atom
CHEMQUESTStructure of the
Atom
Information: Structure of the
Atom
Note the following symbols: (they
are not to scale)
= proton (positive charge)
= electr...
The following three diagrams
are hydrogen atoms:
1
1H 1
2H 1
3H
The following three
diagrams are carbon
atoms:
12
6C 13
6C 14
6C
6 protons,6 neutrons 6 protons,7 neutrons 6 protons,8 neu...
Notice the type of
notation used for atoms:
Z
A
X
x= CHEMICAL SYMBOL OF ELEMENT
Z= ATOMIC NUMBER
A= MASS NUMBER
6
12C, 6
13C , 6
14 C are notations
that represents isotopes of carbon.
1
1 H , 1
2H , 1
3 H are notation that
represents ...
1.How many protons are there in the
following: 1
1
H?, 1
2
H?, 1
3
H?
CRITICAL THINKING QUESTIONS:
1 proton for 1
1
H
1 pr...
2.How many neutrons are found in each of the
following: 1
1 H, 1
2 H, 1
3 H?
0 neutron for 1
1 H
1 neutrons for 1
2 H
2 ne...
3.How many electrons are found in each of
the following: 1
1 H?,1
1 H?,1
1 H?
1 electron for 1
1H
1 electron for 1
2H
1 el...
4.What structural characteristics
do all hydrogen atoms have in
common?
They have the same atomic
number
CRITICAL THINKING...
5. What structural
characteristics do all carbon
atoms have in common?
They have the same atomic number
CRITICAL THINKING ...
6. What does the mass number
tell you?
It tells the number of protons and neutrons in an atom
Can you find it on the perio...
7.What doe the atomic number tell
you?
Yes.
It tells the number of protons in an atom.
Can you find it in the periodic tab...
8. Define the term isotope.
Isotopes is an atom having the same
atomic number but differ in mass
number.
CRITICAL THINKING...
9. How does one isotope of
carbon differ from another
isotope of carbon?
One isotope of carbon is differ in the
number of ...
IsotopesThe atoms of an element
having the same atomic
number but different mass
number due to difference
in the number o...
Mass Number
It refers to the sum of
the numbers of
protons and neutrons
in an atom
Atomic Number
It is a unique number of
each element that
corresponds to the
number of protons
SKILL PRACTICE
30
65Zn
?Protons
? Electrons
? neutrons
Answer
a. 30
b. 3o
c. 35
1. An atom has a mass number of 43
and it also has 21 as atomic number.
a) How many protons does this
atom have?
b) How ma...
Answer
a. 21
b. 21
c. 22
SYMBOL # OF
PROTONS
# OF
ELECTRONS
# OF
NEUTRONS
ATOMIC
NUMBER
MASS
NUMBER
1. 13
27 Al
2.
35
80Br
QUIZ
SYMBOL # OF
PROTONS
# OF
ELECTRONS
# OF
NEUTRONS
ATOMIC
NUMBER
MASS
NUMBER
1. 13
27 Al
13 13 14 13 27
2.
35
80Br
QUIZ
SYMBOL # OF
PROTONS
# OF
ELECTRONS
# OF
NEUTRONS
ATOMIC
NUMBER
MASS
NUMBER
1. 13
27 Al
13 13 14 13 27
2.
35
80Br 35 35 45 ...
SEE YOU
Inside the atom  presentation by loida
Inside the atom  presentation by loida
Inside the atom  presentation by loida
Inside the atom  presentation by loida
Inside the atom  presentation by loida
Inside the atom  presentation by loida
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Inside the atom presentation by loida

  1. 1. Henry Mosely
  2. 2. What are the three sub- atomic particles of the atom?
  3. 3. How do you call the positively charged particles?
  4. 4. How do you call the negatively charged particles?
  5. 5. The particles that were last to be discovered because it is uncharged.
  6. 6. LET’S ENTER THE INVISIBLE WORLD !!
  7. 7. How do we determine the number of protons, neutron and electrons?
  8. 8. The Helium Atom
  9. 9. CHEMQUESTStructure of the Atom
  10. 10. Information: Structure of the Atom Note the following symbols: (they are not to scale) = proton (positive charge) = electron (negative charge) = neutron (no charge)
  11. 11. The following three diagrams are hydrogen atoms: 1 1H 1 2H 1 3H
  12. 12. The following three diagrams are carbon atoms: 12 6C 13 6C 14 6C 6 protons,6 neutrons 6 protons,7 neutrons 6 protons,8 neutrons
  13. 13. Notice the type of notation used for atoms: Z A X x= CHEMICAL SYMBOL OF ELEMENT Z= ATOMIC NUMBER A= MASS NUMBER
  14. 14. 6 12C, 6 13C , 6 14 C are notations that represents isotopes of carbon. 1 1 H , 1 2H , 1 3 H are notation that represents isotopes of hydrogen.
  15. 15. 1.How many protons are there in the following: 1 1 H?, 1 2 H?, 1 3 H? CRITICAL THINKING QUESTIONS: 1 proton for 1 1 H 1 proton for 1 2 H 1 proton for 1 3 H
  16. 16. 2.How many neutrons are found in each of the following: 1 1 H, 1 2 H, 1 3 H? 0 neutron for 1 1 H 1 neutrons for 1 2 H 2 neutrons for 1 3 H CRITICAL THINKING QUESTIONS:
  17. 17. 3.How many electrons are found in each of the following: 1 1 H?,1 1 H?,1 1 H? 1 electron for 1 1H 1 electron for 1 2H 1 electron for 1 3H CRITICAL THINKING QUESTIONS
  18. 18. 4.What structural characteristics do all hydrogen atoms have in common? They have the same atomic number CRITICAL THINKING QUESTIONS
  19. 19. 5. What structural characteristics do all carbon atoms have in common? They have the same atomic number CRITICAL THINKING QUESTIONS
  20. 20. 6. What does the mass number tell you? It tells the number of protons and neutrons in an atom Can you find it on the periodic table Yes, it is only express in atomic mass CRITICAL THINKING QUESTIONS
  21. 21. 7.What doe the atomic number tell you? Yes. It tells the number of protons in an atom. Can you find it in the periodic table? CRITICAL THINKING QUESTIONS
  22. 22. 8. Define the term isotope. Isotopes is an atom having the same atomic number but differ in mass number. CRITICAL THINKING QUESTIONS
  23. 23. 9. How does one isotope of carbon differ from another isotope of carbon? One isotope of carbon is differ in the number of neutrons from the other isotope of carbon. CRITICAL THINKING QUESTIONS
  24. 24. IsotopesThe atoms of an element having the same atomic number but different mass number due to difference in the number of neutrons
  25. 25. Mass Number It refers to the sum of the numbers of protons and neutrons in an atom
  26. 26. Atomic Number It is a unique number of each element that corresponds to the number of protons
  27. 27. SKILL PRACTICE 30 65Zn ?Protons ? Electrons ? neutrons Answer a. 30 b. 3o c. 35
  28. 28. 1. An atom has a mass number of 43 and it also has 21 as atomic number. a) How many protons does this atom have? b) How many electrons does this atom have? c) How many neutrons does this atom have? SKILL PRACTICE
  29. 29. Answer a. 21 b. 21 c. 22
  30. 30. SYMBOL # OF PROTONS # OF ELECTRONS # OF NEUTRONS ATOMIC NUMBER MASS NUMBER 1. 13 27 Al 2. 35 80Br QUIZ
  31. 31. SYMBOL # OF PROTONS # OF ELECTRONS # OF NEUTRONS ATOMIC NUMBER MASS NUMBER 1. 13 27 Al 13 13 14 13 27 2. 35 80Br QUIZ
  32. 32. SYMBOL # OF PROTONS # OF ELECTRONS # OF NEUTRONS ATOMIC NUMBER MASS NUMBER 1. 13 27 Al 13 13 14 13 27 2. 35 80Br 35 35 45 35 80 QUIZ
  33. 33. SEE YOU

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