Chapter 2.2Vocabulary Matching:1. Atom a. At the center of an atom, protons give the nucleus a djsakfhjfhjfhjdfhdjfhdfhdffffffffffpositive charge2. Dalton b.Total number of protons and neutrons in the nucleus of an hfdjsfhdfdjkfhfjdfhdjfhdjfhdjhjatom; superscript to the left of an element (4/2 He)3. Neutron c. Atomic mass unit, or amu 4. Proton d. Protons in the nucleus, written as a subscript to the left of fjadkshfkfhdjfhdjhfjhfjhjhjkajhhan element5. Electrons e. Positive charge6. Atomic Number f. Negative charge7. Atomic Mass # g. Neutral/ No charge8. Isotopes h. An isotope that is unstable; nucleus spontaneously fdkgfjdsgfjdhsgfdghfdkghfkjggdecays, giving off particles and energy.9. Radioactive Isotopes i. An electron in the outermost electron shell10. Electron Shellsj. Atoms that have more neutrons than other atoms from the fjdshfdjhfdjfhdjfhfsadsaldhsfasame element, resulting in a different atomic mass11. Valence Electronsk. The outermost energy shell of an atom12. Valence Shellsl. An energy level of electrons at a certain distance from the fdskfhajjhfdjskhfal nucleus of an atom.13. Atomic Nucleusm. Is the smallest unit of matter that still retains the ffdsjakfdhsafl properties of an element.