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# Determine the number of protons and electrons in each ISBN: 9780321910295 34

## Solution for problem 81P Chapter 4

Introductory Chemistry | 5th Edition

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Problem 81P

Problem 81P

Determine the number of protons and electrons in each ion.

(a) Na+

(b) Ba2+

(c) O2−

(d) Co3+

Step-by-Step Solution:
Step 1 of 3

Solution  81P

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) Na+

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

The atomic number of neutral Na atom Z =11

Thus, no of protons in neutral Na atom = Z =11

Total no. of electrons in neutral Na atom =11

Here,

Na - e- ---> Na+

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

Thus, no of protons in Na+ = 11

Thus, no of electrons in Na+ = 11-1 = 10 e-

(b) Ba2+

The number...

Step 2 of 3

Step 3 of 3

##### ISBN: 9780321910295

Introductory Chemistry was written by and is associated to the ISBN: 9780321910295. This full solution covers the following key subjects: determine, electrons, ion, Protons. This expansive textbook survival guide covers 19 chapters, and 2045 solutions. Since the solution to 81P from 4 chapter was answered, more than 365 students have viewed the full step-by-step answer. The full step-by-step solution to problem: 81P 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. The answer to “Determine the number of protons and electrons in each ion.(a) Na+(b) Ba2+(c) O2?(d) Co3+” is broken down into a number of easy to follow steps, and 14 words.

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