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present in the 2s and 2p subshell, and the remaining are distributed into the 3s and 3p
subshells.
Therefore, the electron configuration of sulphur can be written as
1s2 2s2 2p6 3s2 3p4.

Electron Configuration of Nitrogen. The element nitrogen has 7 electrons (since its atomic
number is 7). The electrons are filled into the 1s, 2s, and 2p orbitals. The electron configuration
of nitrogen can be written as 1s2 2s2 2p3

Oxygen, O has eight protons and eight electrons. The Aufbau principle says the first
two electrons would fill the 1s orbital. The next two would fill the 2s orbital leaving the
remaining four electrons to take spots in the 2p orbital. This would be written as:
1s22s2 2p4
The Aufbau principle works for nearly every element tested. There are two exceptions to this
principle, Chromium and Copper.

Elements

An element is a substance that cannot be broken down into another substance. Each
element is made up of its own type of atom. The periodic table, shows in Figure 2.6, lists
elements in order of atomic number and is laid out so elements with similar chemical
properties form columns (groups). Element also could be defined as all materials or matters
that is composed of only ONE TYPE of ATOM

Table 2.3: Electron configuration using Aufbau Principal

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