# How can I write orbital notations and complete electron configuration for the following elements? a. Beryllium b. aluminium   no

epollock | Student

Orbital notation refers to the electron configuration of an element. The notation tells you how many electrons are in the element, what orbitals of the atom they are in, and in what direction the electrons are spinning. They can spin either clockwise (<) or counterclockwise, (>). In many sources, the notation is usually an up arrow for clockwise rotation, and a down arrow for counter clockwise rotation. Since electrons fill up orbitals in a special way related to their energy level, and only two per sub-level, which does not matter at this time. The orbitals can also only hold a certain number and the limits are as follows:

s=2

p=6

d=10

f=14

Also the orbitals are filled according to this method:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p

Since Beryllium has 4electrons in its ground state the notation is:

1s2 2s2, and this is

1s<>

2s<>

Aluminum has 13 electrons in it s ground state, using arrows for electrons, it is written like this:

﻿﻿﻿1s2 2s2 2p6 3s2 3p1

1s<>

2s<>

2p<> <> <>

3s<>

3p<