Exploring Atoms to Ions: Part 3 Concepts

What does it mean when an element is described as an atom?

• It has a positive charge.

• It has a negative charge.

• It is neutral.

• It has no protons.

Why might the mass number of an isotope not match the atomic mass on the periodic table?

• Because isotopes have different numbers of electrons.

• Because isotopes have different numbers of neutrons.

• Because isotopes have different numbers of protons.

• Because isotopes have different atomic numbers.

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How do you calculate the number of neutrons in an isotope?

• Divide the mass number by the atomic number.

• Multiply the atomic number by the mass number.

• Add the atomic number to the mass number.

• Subtract the atomic number from the mass number.

What is the atomic number of carbon?

• 12

• 14

• 8

• 6

For carbon-14, how many neutrons are present?

• 6

• 8

• 14

• 12

What is the mass number of the oxygen isotope discussed in the video?

• 10

• 8

• 18

• 16

How many protons does oxygen have?

• 16

• 18

• 8

• 10

What does a negative charge on an ion indicate?

• It lost electrons.

• It gained electrons.

• It lost protons.

• It gained protons.

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How many electrons does a bromine ion with a -1 charge have?

• 37

• 36

• 35

• 34

What is the charge of a copper ion with 29 protons and 27 electrons?

• -2

• -1

• +2

• +1