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# Determine whether each statement is true or false. If ISBN: 9780321910295 34

## Solution for problem 83P Chapter 4

Introductory Chemistry | 5th Edition

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Problem 83P

Determine whether each statement is true or false. If false, correct it.

(a) The Ti2+ ion contains 22 protons and 24 electrons.

(b) The I− ion contains 53 protons and 54 electrons.

(c) The Mg2+ ion contains 14 protons and 12 electrons.

(d) The O2− ion contains 8 protons and 10 electrons.

Step-by-Step Solution:
Step 1 of 3

Solution 83P

Here, we have to find the true or false statement.

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 e

(a) The Ti2+ ion contains 22 protons and 24 electrons.

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

The atomic number of neutral Ti atom Z =22

Thus, no of protons in neutral Ti atom = Z =22

Total no. of electrons in neutral Ti atom =22

Here,

Ti - 2e- ---> Ti+2

Here, in Ti+2 ion, no. of protons will be same.

Thus, no of protons in Ti+2 = 22

And the  no. of electrons in Ti 2+ = 22-2 = 20 e-

Hence, the statement (a) is false.

The correct statement is (a)  The Ti2+ ion contains 22 protons and 20 electrons.

(b) The I− ion...

Step 2 of 3

Step 3 of 3

##### ISBN: 9780321910295

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