1. Atoms:
They are everywhere

2. First of all let us think about the size of an atom
Atoms are smaller than the seeds on a bun

3. First of all let us think about the size of an atom
Atoms are smaller than the width of thread

4. First of all let us think about the size of an atom
Atoms are smaller than the pixel on a computer screen

5. First of all let us think about the size of an atom
Atoms are smaller than the width of paper

6. First of all let us think about the size of an atom
Atoms are smaller than bacteria that live on your hands

7. How Many Atoms Are In A Person?
Around …
8,000,000,000,000,000,000,000,000,000
that’s …
eight million-million-million-million-thousand atoms
Wow!

8. What is an Atom?
An atom is the smallest unit of matter

9. Parts of an Atom
Nucleus- the center of the atom that contains the mass of the atom (tight and compact
Electron cloud: region that surrounds the nucleus that contains most of the space in the atom (spaced out and more space occupied
Nucleus
Electron
Cloud

10. What is in the Nucleus? Protons- positively charged particles
Neutrons- neutrally charged particles

11. What is in the Electron Cloud?
Electrons- smallest of the 3 and has barely any mass; negatively charged

12. Bohr’s Model of an Atom

13. Electrons
The electron cloud has a number of different rings depending on how many electrons it had
1st Ring-Hold 2 electrons
2nd Ring- Holds 8 electrons
3rd Ring- Holds 18 electrons
4th Ring- Holds 32 electrons