Q. 4.29 - An Introduction to General, Organic, and Biological Chemistry

Question

How many protons and electrons are there in a neutral atom of each of the following elements?

a. argon

b. manganese

c. iodine

d. cadmium

Step-by-Step Solution

Answer

a. $18$ protons, $18$ electrons
b. $25$ protons, $25$ electrons
c. $53$ protons, $53$ electrons
d. $48$ protons, $48$ electrons

Part(a) Step 1: Given information

We need to find the number of protons and electrons for argon.

Part(a) Step 2: Explanation

We know that atomic number of an element is equal to the number of protons present in it and for a neutral atom, the number of electrons and protons are equal.

Atomic number of argon is $18$ so,

Number of protons in argon are $18$,

Number of electrons in argon are $18$,

Part(b) Step 1: Given information

We need to find the number of protons and electrons for manganese.

Part(b) Step 2: Explanation

We know that atomic number of an element is equal to the number of protons present in it and for a neutral atom, the number of electrons and protons are equal.

Atomic number of manganese is $25$ so,

Number of protons in manganese are 25. 

Number of electrons in manganese are 25.

Part(c) Step 1: Given information

We need to find the number of protons and electrons for iodine.

Part(c) Step 2: Explanation

We know that atomic number of an element is equal to the number of protons present in it and for a neutral atom, the number of electrons and protons are equal.

Atomic number of iodine is $53$ so,

Number of protons in iodine are $53$

Number of electrons in iodine are $53$

Part(d) Step 1: Given information

We need to find the number of protons and electrons for cadmium.

Part(d) Step 2: Explanation

We know that atomic number of an element is equal to the number of protons present in it and for a neutral atom, the number of electrons and protons are equal.

Atomic number of cadmium is $48$ so,

Number of protons in cadmium are $48$.

Number of electrons in cadmium are $48$.