Q. 4.103 - An Introduction to General, Organic, and Biological Chemistry

Question

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

a. an atom with four protons and five neutrons.

b. an atom with $12$ protons and $14$ neutrons

c. a calcium atom with a mass number of $46$

d. an atom with $30$electrons and $40$ neutrons.

Step-by-Step Solution

Answer

a. The atomic symbol is ${}_4{}^{9}Be$.

b. The atomic symbol is ${}_{12}{}^{26}Mg$.

c. The atomic symbol is  ${}_{20}{}^{46}Ca$.

d. The atomic symbol is ${}_{30}{}^{70}Zn$.

Part (a) step 1: Given Information

We need to find the atomic symbol of an atom with four protons and five neutrons. 

Part (a) step 2: Simplify

Here,

The standard form is-  ${}_z{}^{A}X$

A is the atomic mass

z is the atomic number

X is the name of the atom.

According to the periodic table, We know that the atomic number of  $4$is Beryllium,

So,

${}_4{}^{?}Be$

Now, the atomic mass is the sum of atomic protons and neutrons:

$$\begin{gathered} A=Protons +Neutrons \\ A=4+5 \\ A=9 \end{gathered}$$

The atomic symbol of  Beryllium is ${}_4{}^{9}Be$

Part (b) step 1: Given Information

We need to find the atomic symbol of an atom with $12$  protons and $14$ neutrons  

Part (b) step 2: Simplify

Here,

The standard form is-  ${}_z{}^{A}X$

A is the atomic mass

z is the atomic number

X is the name of the atom.

According to the periodic table, We know that the atomic number of $12$ is Magnesium.

So,

${}_{12}{}^{?}Mg$

Now, the atomic mass is the sum of atomic protons and neutrons:

$$\begin{gathered} A=Protons +Neutrons \\ A=12+14 \\ A=26 \end{gathered}$$

The atomic symbol of Magnesium  ${}_{12}{}^{26}Mg$.

Part (c) step 1: Given Information

We need to find the atomic symbol of a calcium atom with a mass number of  $46$.

Part (c) step 2: Simplify

Here,

The standard form is- ${}_z{}^{A}X$

A is the atomic mass

z is the atomic number

X is the name of the atom.

According to the periodic table, We know that the atomic number of $20$is Calcium,

So,

${}_{20}{}^{?}Ca$

Here, the atomic number is $46$.

Thus, the atomic symbol of Calcium  ${}_{20}{}^{46}Ca$.

Part (d) step 1: Given Information

We need to find the atomic symbol of  an atom with $30$ electrons and $40$neutrons.

Part (d) step 2: Simplify

Here,

The standard form is-  ${}_z{}^{A}X$

A is the atomic mass

z is the atomic number

X is the name of the atom.

According to the periodic table, We know that the atomic number of $30$ is Zinc.

So,

${}_{30}{}^{?}Zn$

Now, the atomic mass is the sum of atomic protons and neutrons:

$$\begin{gathered} A=Protons +Neutrons \\ A=30+40 \\ A=70 \end{gathered}$$

The atomic symbol of Zinc ${}_{30}{}^{70}Zn$.