How to solve the electron configuration
Answers
Answer:
Sometimes you need to know where electrons are likely to be in an atom. Electron configurations help you to do this. To calculate an electron configuration, divide the periodic table into sections to represent the atomic orbitals, the regions where electrons are contained. Groups one and two are the s-block, three through 12 represent the d-block, 13 to 18 are the p-block and the two rows at the bottom are the f-block. The row numbers one through seven represent the energy levels that contain the orbitals and electrons.
Writing the Configuration
Starting at the top of the periodic table and moving from left to right across the rows, write the row number, the block letter and how many squares are in each block's section until you get to the desired element. To calculate the electron configuration for phosphorus (P), which is in the third row, p-block, third element in that block, write: 1s2 2s2 2p6 3s2 3p3. Check your work by adding the electron numbers to see if they equal the atomic number of the element; for this example, you would write: 2+2+6+2+3=15, which is the atomic number of phosphorus.
Answer:
electronic configuration is a method of making an octet(or duplet in the first shell) if an element has 20 electrons the electronic configuration will be 2,8,8,2 the valence electrons are 2