1. TOPIC: Chemistry AIM: What is matter?

2. Anything that has mass & volume
matter

3. element
Simple substance that CANNOT be broken down into something more simple
Made of one type of atom.

4. Chemical symbol = abbreviation
1 capital letter (N)
or 1 capital & 1 lower case (He)

7. Smallest part of an element
atom

9. Proton =
Inside nucleus
Positive charge
Protons

10. Neutron =
Inside nucleus
No charge (neutral)
Neutrons

11. Outside nucleus (electron cloud) Negative charge
Electrons =
Outside nucleus (electron cloud)
Negative charge
Electrons

12. Electron Cloud

13. Neutrons
Protons
Electrons

14. Atomic
number
# of protons
Never changes
Different for each element

17. Atomic
Mass/
Mass #
Measured in atomic mass units
Formula to find the Mass # is
# of Protons + # of Neutrons

20. Review:
What are the 3 subatomic particles in an atom?
Where are electrons located in an atom?
The ____of an atom is the number of protons in its nucleus.  
The positively charged center of an atom is its
The nucleus of an atom is comprised of____.
A chlorine atom has 17 protons and 18 neutrons. What is its atomic number?  
In a neutral atom, _____ will always be present in equal numbers.