Electronic Structure Of The Atom Worksheet (Page 2 of 5) in pdf

Electronic Structure Of The Atom Worksheet Page 2

The atomic number represents the number of protons in an atom, which is also the number of electrons since there are an

equal number of protons and electrons in every atom.

Example:

Element

Atomic Number

Number of Protons

Number of Electrons

Fill in the needed information below.

Element

Atomic Number

Number of Protons

Number of Electrons

The next task is to determine how many electrons go into each of the seven energy levels. We can do this by using the

mathematical formula 2n2, where n is the number of the energy level.

Example:

Energy Level = n

Substituted for

Maximum Number

n in Formula

of Electrons in Level

2 (1 x 1) = 2

2 (2 x 2) = 8

To arrange the electrons in the energy levels, we use our ability to find the total number of electrons an atom has and our

ability to find the maximum number of electrons in each energy level. Except for a limitation that will be explained later,

the energy levels fill from the first one on out. The first level of any atom can hold maximum of two electrons and the

second level can hold a maximum of eight.

Example:

Element

Number of Electrons

Arrangement of Electrons in Energy Levels

The fluorine atom has a total of nine electrons to distribute in the seven levels. The first level took two of the nine

electrons, leaving only seven for the second level even though it could hold eight.

Electronic Structure Of The Atom Worksheet Page 2