1. Inside An Atom

3. Nucleus Every Atom has a core called a nucleus. Every Atom has a core called a nucleus. The Nucleus is largest part of an atom (about 99.9% of it’s mass) The Nucleus is largest part of an atom (about 99.9% of it’s mass) Within the nucleus are very small particles called protons and neutrons Within the nucleus are very small particles called protons and neutrons Electrons are in an orbit around the nucleus Electrons are in an orbit around the nucleus

4. Protons Protons are the positively charged particles found inside the nucleus of an atom Protons are the positively charged particles found inside the nucleus of an atom Every element has a unique atomic #. This # is the amount of protons inside that elements nucleus Every element has a unique atomic #. This # is the amount of protons inside that elements nucleus For Example: Oxygen has an atomic # of 8. How many protons does it have? For Example: Oxygen has an atomic # of 8. How many protons does it have? 8

5. Neutrons Neutrons are the other particle found inside the nucleus of an atom Neutrons are the other particle found inside the nucleus of an atom Neutrons have no charge Neutrons have no charge Atoms of a same element may not carry the same number of neutrons Atoms of a same element may not carry the same number of neutrons

6. Electrons Negatively charged particles found orbiting around the nucleus Negatively charged particles found orbiting around the nucleus Electrons are very small; only about 1/2000th the mass of a proton or neutron Electrons are very small; only about 1/2000th the mass of a proton or neutron Electrons can move between atoms which causes bonds; this is how new compounds are formed Electrons can move between atoms which causes bonds; this is how new compounds are formed