1. Chemistry Project Maynard

2. Boron Atomic number:5 Atomic mass:10.81 Protons: 5 Neutrons: 6 Electrons: 5 Common isotopes: boron 10,11 Average Atomic mass: 10.811 amu Electron configuration 1s2 2s2 2p1 [He] 2s2 2p1

3. Boron cont.

4. Manganese Atomic Number: 25 Atomic mass: 54.938 Protons: 25 Neutrons: 30 Electrons: 25 Average Atomic mass: 54.93805 amu Electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d5 [Ar] 4s2 3d5

5. Manganese Cont.

6. Promethium Atomic Number: 61 Atomic Mass: 145 Protons: 61 Neutrons: 84 Electrons: 61 Common Isotopes: Promethium 145, 146, 147 Average atomic mass 145 amu Electron configuration [Xe] 4f5 6s2 1s2 2s2p6 3s2p6d10 4s2p6d10f5 5s2p6 6s2

7. Promethium cont.