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How To write an electron configuration: Determine the total number of electrons to be represented. Use the Aufbau process to fill the orbitals with electrons. The Aufbau process requires that electrons fill the lowest energy orbitals first. In another words, atoms are built from the ground upwards.
sublevels (s, p, d, f), orbitals (s has I , p has 3, d has 5, f has 7) and spin (two electrons allowed per orbital), Example: Draw the electron configuration of sodium (atomic #11). Answer: 1s2 2S2 Draw the electron configurations of the following atoms, ©lnstructional Fair, Inc. 3, 4, , Inco a O 29 Chemistry
1. The atomic number of boron is 5. The correct electronic configuration of boron is: A. 1s22s3 B. 1s22p3 C. 1s22s22p1 D. 2s22p3 E. 1s22s23s1. 2. How many distinct p orbitals exist in the second electron shell, where n = 2? 3. An oxygen atom has __________ valence electrons. 4. Draw a correct Lewis structure for boric acid, B(OH)3. 5.
• The 2s2 means that the next 2 electrons go into the s orbital in the second energy level. • The 2p5 means that the next 5 electrons go into the p orbitals in the second energy level or second shell. Remember that 5 electrons cannot fit into one orbital. The p subshell actually contains 3 orbitals, which all together, could hold up to 6 ...
three p orbitals in each shell, p orbitals are represented by 3 boxes. The arrows show the spin (‘up’ or ‘down’) of the electrons. • The Aufbau Principle says that electrons are added to the lowest energy atomic orbitals available. • The Pauli Exclusion Principle says that no two electrons can have the same set of quantum numbers.
This worksheet provides extra practice for writing electron configurations. The easiest and most reliable technique for writing electron configurations is to use the periodic table as your guide. Details of using the periodic table as a guide for determining electron configurations can be found on the CH301 website. 1.
QUANTUM NUMBERS WORKSHEET Name ________________________________. State the four quantum numbers and the possible values they may have. Name the orbitals described by the following quantum numbers. a. n = 3, L = 0. b. n = 3, L = 1. c. n = 3, L = 2. d. n = 5, L = 0.
