Valence Electrons Group Properties 5 3 Valence Electrons
- Slides: 23
Valence Electrons & Group Properties 5. 3
Valence Electrons �Elements in a group have similar properties because they have the same number of valence electrons. �A valence electron is an electron that is in the highest occupied energy level of an atom.
Valence Electrons & Group Number When the A groups in the periodic table are numbered from 1 through 8, the group number matches the number of valence electrons in the electron configuration of an element in that group. • Valence electrons play a key role in chemical reactions. • Properties vary across a period because the number of valence electrons increases from left to right.
Alkali Metals �Group 1 A � 1 Valence Electron �Extremely Reactive and thus found only in nature as compounds
Alkaline Earth Metals �Group 2 A � 2 Valence Electrons �Highly Reactive Oyster shell with pearl Spinach plant Plaster cast
Boron Family �Group 3 A � 3 Valence Electrons �Ex: Aluminum = Most abundant metal in Earth’s Crust �Lab Glass materials
Carbon Family �Group 4 A � 4 Valence Electrons
Nitrogen Family �Group 5 A � 5 Valence Electrons �Elements with a wide range of physical properties �Used a lot in fertilizer
Oxygen Family �Group 6 A � 6 Valence Electrons �Ex: Oxygen is the most abundant element in the Earth’s crust
Halogens �Group 7 A � 7 Valence Electrons �Found as gas, liquid or solid �Despite these differences, chemical properties are the same
Noble Gases �He has 2 valence electrons �All the others have 8 �Colorless, odorless and extremely unreactive = STABLE
Noble Gases �But, when electric current passes through noble gases, they emit different colors. Helium emits pink, neon emits orange-red, argon emits lavender, krypton emits white, and xenon emits blue.
Electron Dot Diagram �When is an atom unlikely to react? �When the highest occupied energy level of an atom is filled with electrons, the atom is stable and not likely to react.
Electron Dot Diagram �The chemical properties of an element depend on the number of valence electrons. An electron dot diagram is a model of an atom in which each dot represents a valence electron. The symbol in the center represents the nucleus and all the other electrons in the atom.
Electron Dot Diagram
Electron Dot Diagram
Electron Dot Diagram
Electron Dot Diagram
Electron Dot Diagram
Electron Dot Diagram
Electron Dot Diagram
Electron Dot Diagram
Electron Dot Diagram
- Valence electron
- Elements with 7 valence electrons
- Valence electrons of each group
- Group 1 valence electrons
- Valence electrons by group
- Outermost electrons
- 3 valence electrons
- Valence electrons of fluorine
- S22- lewis structure
- What is group 16 called in the periodic table
- Glenn seaborg contribution to the periodic table
- Nitrogen valence electrons
- Valence electrons of gallium
- Atoms with 4 valence electrons
- How to calculate valence electrons
- Oxygen symbol
- Periodic table valence electrons
- Whats a ionic bond
- Scn- lewis structure
- Atoms with 4 valence electrons
- Orbital diagram
- Carbon bohr model
- Dot symbol
- Is potassium nitride ionic or covalent