2. Learning Objectives:
Describe the subatomic particles
Identify the number of protons,
electrons, neutrons, mass number and
atomic number in given isotope
Define isotopes
3. What are atoms
made of?
-tiny, very light particles
-have a negative electrical charge (-)
-move around the outside of the
nucleus
ELECTRONS
9. Atomic Number
and Mass Number
Atomic Number
All atoms can be identified by the number of
protons and neutrons they contain.
The atomic number (Z) determine the identity
of an element.
It is the number of protons in the nucleus
Atoms are neutral, so it’s also the number of
electrons.
13. Atomic Number
and Mass Number
Mass Number
The mass number (A) is the total number
of protons and neutrons.
Protons and neutrons are collectively
referred to as nucleons.
30. Element:____________
Atomic Number:______
Mass Number:________
No. of Protons:________
No. of Electrons:_______
No. of Neutrons:_______
Element:____________
Atomic Number:______
Mass Number:________
No. of Protons:________
No. of Electrons:_______
No. of Neutrons: 6
Complete the information below for each
given isotope:
31. Element:____________
Atomic Number:______
Mass Number:________
No. of Protons:________
No. of Electrons:_______
No. of Neutrons: 42
Element:____________
Atomic Number:______
Mass Number:________
No. of Protons:________
No. of Electrons:_______
No. of Neutrons:______
Complete the information below for each
given isotope:
