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Lessons
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- Connection Among the Location in the Table, the Atomic Number, and Mass
- How to Identify Metals, Semimetals, Nonmetals, and Halogens
- How to Identify Alkaline Metals, Alkaline Earth Metals, and Transition Metals
- Lanthanide, Actinide, Transactinide, and Transuranium Elements
- Ionization Energy, Electronegativity, Relative Sizes
- How Many Electrons Can Bond?
- Size and Mass
- Location and Quantum Electron Configuration
Location and Quantum Electron Configuration
The electron configuration of an atom is expressed in a form of notation which shows how the electrons are distributed among its various energy levels and orbitals.
The format for writing it is this: 1s2
The number 1 refers to the energy level (in this case, energy level 1). The "s" stands for subshell that the electrons are occupying. The superscript number 2, (raised) tells us the number of electrons in that subshell.
