An atom consists of a small, positively charged nucleus,

Last updated: 8/5/2022

An atom consists of a small, positively charged nucleus, surrounded by negatively charged electrons. We organize the electrons in a logical manner. As the atomic number increases, electrons are added to the subshells according to their energy. Lower energy subshells fill before higher energy subshells. The order of filling is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p. The periodic table can be used to help you remember the order. Part A Review Constants I Periodic Table Give the complete ground-state electron configuration for silicon (Si). Express the complete electron configuration using superscripts where appropriate. For example, the configuration for Li would be entered as 1s^22s^1. ▸ View Available Hint(s) 1s^2, 2s^2, 2p^6, 3s^2, 3p^2.