Q. 4.50 - An Introduction to General, Organic, and Biological Chemistry

Question

Write the electron arrangement for each of the following
elements: (Example: sodium $2,8,1$)
a. Phosphorus
b. Neon 
c. Sulfur

d. Magnesium

e. Aluminum 
f. Fluorine 

Step-by-Step Solution

Answer

Electron arrangement of elements are:

(a) Phosphorus $(2, 8, 5)$
(b) Neon $(2, 8)$
(c) Sulfur $(2, 8, 6)$

(d) Magnesium $(2, 8, 2)$

(e) Aluminum $(2, 8, 3)$
(f) Fluorine $(2, 7)$

Part (a) Step 1: Given information

We need to find electron arrangement for phosphorus.

Part (a) Step 2: Explanation

Atomic number phosphorus = $15$

Symbol = $P$

Electron arrangement = $2,8 , 5$

Hence, electron arrangement of phosphorus is $2, 8, 5$ 

Part (b) Step 1: Given information

We need to find electron arrangement for neon.

Part (b) Step 2: Explanation

Atomic number neon = $10$

Symbol = $Ne$

Electron arrangement = $2, 8$ 

Hence, electron arrangement of neon is $2, 8$

Part (c) Step 1: Given information

We need to find electron arrangement for sulfur.

Part (c) Step 2: Explanation

Atomic number sulfur = $16$

Symbol = $S$

Electron arrangement = $2, 8, 6$

Hence, electron arrangement of sulfur is $2, 8, 6$.

Part (d) Step 1: Given information

We need to find electron arrangement for magnesium.

Part (d) Step 2: Explanation

Atomic number magnesium = $12$

Symbol = $Mg$

Electron arrangement = $2, 8, 2$

Hence, electron arrangement of magnesium is $2, 8, 2$.

Part (e) Step 1: Given information

We need to find electron arrangement for aluminum.

Part (e) Step 2: Explanation

Atomic number aluminum = $13$

Symbol = $Al$

Electron arrangement = $2, 8, 3$

Hence, electron arrangement of aluminum is $2, 8, 3$

Part (f) Step 1: Given information

We need to find electron arrangement for fluorine.

Part (f) Step 2: Explanation

Atomic number fluorine = $9$

Symbol = $F$

Electron arrangement = $2, 7$

Hence, electron arrangement of fluorine is $2, 7$