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Determine the number of protons and electrons in each ion.(a) Al3+(b) S2?(c) I?(d) Ag+

Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro ISBN: 9780321910295 34

Solution for problem 82P Chapter 4

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro

Introductory Chemistry | 5th Edition

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4
Problem 82P

Determine the number of protons and electrons in each ion.

(a) Al3+

(b) S2−

(c) I−

(d) Ag+

Step-by-Step Solution:
Step 1 of 3

Solution 82P

Here, we are going to calculate the number of protons and electrons of each ion.

Mass Number: The sum of the number of protons and neutrons in an atom is called its mass number. This is denoted by A.

Atomic number: The number of protons present in the nucleus in an atom is called its atomic number. It is denoted by Z.

We know,

The number of protons and electrons are always same for a neutral atom. Thus, ions are formed by losing or gaining of electrons. A positively charged ion is formed when an atom loses its electron.  So no. of protons always remain same. For example:

Li ------> Li+ + e-

Here, no of protons in Li+ ion will be = 3

But the electrons will  be = 3-1 = 2 e-

Similarly,

A negatively charged ion is formed when atoms gain electrons.

For example : F + e- -----> F-

Total no of protons of F- ion will be same as neutral F,

But the no electrons of F- ion will be = 9+1= 10

(a) Al3+

The number of protons and electrons are always same for a neutral atom.

The atomic number of neutral Al atom Z =13

Thus, no of protons in neutral Al atom = Z =13

Total no. of electrons in neutral Al atom =13

Here,

Al - 3e- ---> Al3+

Here, in ion, no of protons will be same.

Thus, no of protons in Al3+ = 13

Thus, no of electrons in Al3+ = 13-3 = 10 e-

(b) S2-

The number of protons and electrons are always same for a neutral atom.

The atomic number of neutral S atom Z =16

Thus, no of protons in neutral S atom = Z =16

Total no. of electrons in neutral S atom =16

Here,

S+ 2e- ---> S2-

Here, in S2- ion, no. of protons will be same.

Thus, no of protons in S2- = 16

Hence, no of electrons in S2- = 16+2 = 18 e-

(c) I

The number of protons and electrons are always same for a neutral atom.

The atomic number of neutral I atom Z =53

Thus, no of protons in neutral I atom = Z =53

Total no. of electrons in neutral I atom =53

Here,

I + e- ---> I-

Here, in I- ion, no. of protons will be same.

Thus, no of protons in I- = 53

Hence, no of electrons in I- = 53+1 = 54 e-

(d) Ag+

The number of protons and electrons are always same for a neutral atom.

The atomic number of neutral Ag atom Z =47

Thus, no of protons in neutral Ag atom = Z =47

Total no. of electrons in neutral Ag atom =47

Here,

Ag - e- ---> Ag+

Here, in Ag+ ion, no. of protons will be same.

Thus, no of protons in Ag+ = 47

Hence, no of electrons in Ag+ = 47-1 = 46 e-

The table for the no. of electrons and protons for each ion.

Step 2 of 3

Chapter 4, Problem 82P is Solved
Step 3 of 3

Textbook: Introductory Chemistry
Edition: 5
Author: Nivaldo J Tro
ISBN: 9780321910295

This full solution covers the following key subjects: determine, electrons, ion, Protons. This expansive textbook survival guide covers 19 chapters, and 2046 solutions. The full step-by-step solution to problem: 82P from chapter: 4 was answered by , our top Chemistry solution expert on 05/06/17, 06:45PM. This textbook survival guide was created for the textbook: Introductory Chemistry, edition: 5. Introductory Chemistry was written by and is associated to the ISBN: 9780321910295. The answer to “Determine the number of protons and electrons in each ion.(a) Al3+(b) S2?(c) I?(d) Ag+” is broken down into a number of easy to follow steps, and 14 words. Since the solution to 82P from 4 chapter was answered, more than 427 students have viewed the full step-by-step answer.

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Determine the number of protons and electrons in each ion.(a) Al3+(b) S2?(c) I?(d) Ag+