Practice Ion in Chemistry

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

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Quick Recap

An atom or group of atoms that has gained or lost one or more electrons, resulting in a net positive charge (cation) or net negative.

An atom that's not neutral—it has more or fewer electrons than protons.

Showing a random 20 of 50 problems.

Example 1

medium
An ion has charge +1, 11 protons, and a noble-gas electron configuration. Which ion is it?

Example 2

hard
List the ions produced when 1 mol of Al2(SO4)3\text{Al}_2(\text{SO}_4)_3 dissociates in water.

Example 3

medium
Predict the ion formed by sulfur (Z = 16).

Example 4

easy
Does becoming an ion change the proton count of an atom?

Example 5

easy
Write the symbol and charge of the iron(III) ion.

Example 6

easy
When NaCl dissolves in water, what ions form?

Example 7

medium
Aluminum loses 3 electrons. What ion forms, and why is its charge positive?

Example 8

medium
A particle has 8 protons and 10 electrons. Cation or anion, what charge, and what ion?

Example 9

challenge
An ion is isoelectronic with neon (10 electrons), has a +2 charge, and is a metal. Identify it.

Example 10

medium
A particle has 17 protons and 18 electrons. Cation or anion, and what charge?

Example 11

easy
Write the formula and charge of the sulfate ion.

Example 12

easy
Is an anion positive or negative?

Example 13

medium
Write the formula for the ionic compound between Al and O.

Example 14

medium
Potassium and chlorine react. Write both ions and show the resulting compound's neutrality.

Example 15

easy
Magnesium loses 2 electrons. Write its ion.

Example 16

easy
An oxygen atom gains 2 electrons. Write its ion and charge.

Example 17

medium
Write the formula for the ionic compound formed from NH4+\text{NH}_4^+ and SO42−\text{SO}_4^{2-}.

Example 18

medium
An ion has 16 protons and 18 electrons. Write the ion symbol.

Example 19

medium
Write the ionic formula for the compound between Mg and Cl.

Example 20

medium
Identify the ion: 35 protons, 36 electrons.
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