Q. 4.104 - An Introduction to General, Organic, and Biological Chemistry

Question

Write the atomic symbol for each of the following: $(4.4,4.5)$

a. an aluminum atom with $14$ neutrons.

b. an atom with atomic number $26 and 32$ neutrons.

c. a strontium atom with $50$ neutrons

d. an atom with a mass number of $72$ and atomic number $33$

Step-by-Step Solution

Answer

a. The atomic symbol is $\begin{array}{c}27\\ 13 \end{array}Al$.

b. The atomic symbol is  $\begin{array}{c}58\\ 26\end{array}Fe$.

c. The atomic symbol is $\begin{array}{c}88\\ 38\end{array}Sr$.

d.  The atomic symbol is $\begin{array}{c}72\\ 33\end{array}As$.

Part (a) step 1: Given Information

We need to find the atomic symbol of an aluminum atom with $14$ neutrons. 

Part (a) step 2: Simplify

Here,

The standard form is-  $\begin{array}{c}A\\ z\end{array}X$

According to the periodic table, We know that the atomic number of aluminum is $13$.

Then, the atomic number is equal to the number of protons. So protons is $13$.

$$\begin{gathered} A=Protons +Neutrons \\ A=13+14 \\ A=27 \end{gathered}$$

The atomic symbol of aluminum is - $\begin{array}{c}27\\ 13 \end{array}Al$.

Part (b) step 1: Given Information

We need to find the atomic symbol of an atom with atomic number $26 and 32$ neutrons. 

Part (b) step 2: Simplify

Here,

The standard form is-  $\begin{array}{c}A\\ z\end{array}X$

According to the periodic table, We know that the atomic number of Iron (Fe) is $26$.

Then, the atomic number is equal to the number of protons. So protons is $26$.

$$\begin{gathered} A=Protons +Neutrons \\ A=26+32 \\ A=58 \end{gathered}$$

The atomic symbol of Iron is -$\begin{array}{c}58\\ 26\end{array}Fe$.

Part (c) step 1: Given Information

We need to find the atomic symbol of a strontium atom with $50$ neutrons.

Part (c) step 2: Simplify

The standard form is-  $\begin{array}{c}A\\ z\end{array}X$

According to the periodic table, We know that the atomic number of strontium  (Sr) is $38$.

 Then, the atomic number is equal to the number of protons. So protons is $38$.

$$\begin{gathered} A=Protons +Neutrons \\ A=38+50 \\ A=88 \end{gathered}$$

The atomic symbol of strontium is- $\begin{array}{c}88\\ 38\end{array}Sr$

Part (d) step 1: Given Information

We need to find the atomic symbol of an atom with a mass number of $72$ and atomic number $33$.

Part (d) step 2: Simplify

The standard form is- $\begin{array}{c}A\\ z\end{array}X$

According to the periodic table, We know that the atomic number of arsenic  (As) is  $33$.

The atomic symbol of arsenic (As) is - $\begin{array}{c}72\\ 33\end{array}As$.