Ion Review

Ion Review

What are ions?

• An ion is an atom with charge

• Ions do not have the same number of protons and electrons

How can you determine the charge of an ion?

• Method 1: Equation

• protons-electrons= charge

• Ex: An atoms has 16 protons, 16 neutrons, and 18 electrons. What is the charge of the ion?

• 16 p - 18 e= -2

• The charge would be negative 2

How can you determine the charge of an ion?

• Method 2: Compare protons & electrons

• More protons= positive ion, More electrons=negative ion

• Ex: An atoms has 16 protons, 16 neutrons, and 18 electrons. What is the charge of the ion

• There are 2 more electrons than protons so the ion is negative.

• The charge would be negative 2 (-2)

Multiple Choice

Ions are atoms with...

• charge due to a difference in protons and electrons

• charge due to a difference in protons and neutrons

Multiple Choice

An ion with more protons than electrons will be...

• neutral

• positive

• negative

Multiple Choice

An ion with more electrons than protons will be...

• neutral

• positive

• negative

Multiple Choice

What is the charge of an ion that has 10 protons and 7 electrons

• -3

• +3

• +17

• -17

Multiple Choice

What is the charge of an ion with 4 protons, 4 neutrons, and 6 electrons?

• -8

• +2

• 8

• -2

Multiple Choice

What is the charge of an ion with 12 protons, 12 neutrons, and 10 electrons?

• -4

• +2

• +4

• -2

What if you are asked to determine electrons?

• Ex: An ion with 10 protons has a charge of -3. How many electrons does it have?

• protons- electrons = charge; Solve for e

• 10 p - e = -3

• e= 13

• Or you can say because it is -3 it must have 3 more electrons than protons, therefore there 10 +3= 13 elecrtons

Multiple Choice

An ion with a charge of +1 has 11 protons. How many electrons are there?

• 10

• 11

• 12

Multiple Choice

An ion with a charge of -2 has 6 protons. How many electrons does it have?

• 4

• 6

• 8

Multiple Choice

An ion of Calcium has a charge of +2. How many electrons does it contain?

Hint: reference Periodic Table

• 22

• 18

• 20

Isotope Symbols

• Remember isotope symbols follow the layout to the right

Multiple Choice

What is the correct isotope symbol for an ion with 8 protons, 9 neutrons, and 10 electrons?

Multiple Choice

What is the correct isotope symbol for an ion with 19 protons, 19 neutrons, and 18 electrons?