Demoooo

1. Structure of the Atom
Lesson 1

2. Can an atom be broken into smaller parts?
Focus Question

3. electron
neutron
proton
nucleus
atom
New Vocabulary
atomic number
mass number

4. element: substance with atoms that are all alike
Review Vocabulary

5. • An atom is the smallest particle of an element
that retains the element’s properties.
• Atoms are composed of even smaller particles—
subatomic particles—called protons, neutrons,
and electrons.
Subatomic Particles

6. Let’s Explore

7. The small, positively-charged center of the atom is
called the nucleus. The nucleus contains protons
and neutrons.
• Protons are particles with an electric charge of
1+. The number of protons in the nucleus is
unique for each element.
• Neutrons are electrically neutral particles in the
nucleus; they do not have a charge.
• Electrons are particles with an electric charge of
1−. They occupy the space surrounding the
nucleus of an atom.
Subatomic Particles

8. quark
D
neutron
C
electron
B
proton
A
Which is NOT found in the nucleus of an atom?
1.
CORRECT
Quiz

9. electrons and quarks
D
quarks and neutrons
C
electrons and protons
A
protons and neutrons
B
Which subatomic particles have equal and opposite
charges?
3.
CORRECT
Quiz

10. Atomic number
or
atomic mass

11. Element Atomic
Number
Protons Neutrons Mass
Number
Boron 5 5 6 11
Copper 29 29 34 63
• The number of protons in an atom’s nucleus is
equal to its atomic number.
• The mass number of an atom is the sum of
the number of protons and the number of
neutrons in the nucleus of the atom.
Atomic Mass

12. 16
D
15
C
7
A
8
B
How many neutrons does an atom of oxygen-15 have?
3.
CORRECT
Quiz

13. Let’s play

14. One more challenge

15. ( ) Protons
( ) Neutrons
( ) Electrons
Atomic number ( )
Mass number ( )
Total Charge ( )
Neutral atom ( )
Ion ( )
___ ___
Li
____