Final answer:
The last electron in an atom can be represented using quantum numbers, configuration, dot structure, or orbital notation.
Step-by-step explanation:
The last electron in an atom is represented by a set of quantum numbers. These numbers include the principal quantum number (n), the azimuthal quantum number (l), the magnetic quantum number (ml), and the spin quantum number (ms). For example, if the last electron is in the 3d subshell, the quantum numbers would be n=3, l=2, ml=-1, and ms=±1/2.
The configuration of an atom can be represented using numbers, letters, and superscripts. For example, the configuration of the last electron in nitrogen (atomic number 7) would be 1s^2 2s^2 2p^3.
An atom can be represented using dot structure or Lewis structure notation. In this notation, the symbol of the element is surrounded by dots, with each dot representing one valence electron. For example, the dot structure of oxygen (atomic number 8) would have two dots on each side of the element symbol.
An atom can also be represented using orbital notation, where each orbital is represented by a box and the electrons are represented by arrows. For example, the orbital notation of carbon (atomic number 6) would have two electrons in the 1s orbital and two electrons in the 2s orbital, with one electron each in the three 2p orbitals.
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