Chemistry Project

Maynard

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

Boron cont.

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

Manganese Cont.

Promethium

Atomic Number: 61Atomic Mass: 145Protons: 61Neutrons: 84Electrons: 61Common Isotopes: Promethium 145, 146, 147

Average atomic mass 145 amu Electron configuration

[Xe] 4f5 6s2 1s2 2s2p6 3s2p6d10 4s2p6d10f5 5s2p6 6s2

Promethium cont.