Understanding Atomic and Mass Numbers

This video tutorial covers the concepts of atomic number, mass number, and electric charge. It explains how these concepts are represented in the periodic table using examples of nitrogen and boron isotopes. The video also discusses the natural abundance of isotopes and provides problem-solving exercises to determine atomic number, mass number, net electric charge, and element identity.

What does the atomic number of an element represent?

• The atomic mass

• The number of protons

• The number of electrons

• The number of neutrons

How can you determine which isotope of an element is more abundant?

• By counting the number of electrons

• By comparing their atomic numbers

• By comparing their mass numbers

• By looking at the average atomic mass

What is the atomic number of boron?

• 5

• 10

• 11

• 15

What is the net electric charge of an atom with equal numbers of protons and electrons?

• Positive

• Negative

• Zero

• Depends on the number of neutrons

If an atom has 6 protons, 7 neutrons, and 6 electrons, what is its mass number?

• 6

• 7

• 13

• 19

What is the identity of an element with 9 protons?

• Carbon

• Oxygen

• Fluorine

• Nitrogen

An ion with 9 protons and 10 electrons has what charge?

• Positive two

• Negative one

• Positive one

• Zero

What is the mass number of an element with 13 protons and 14 neutrons?

• 27

• 14

• 28

• 13

Which element has an atomic number of 13?

• Carbon

• Nitrogen

• Fluorine

• Aluminum

An ion with 13 protons and 10 electrons has what charge?

• Positive three

• Negative three

• Positive one

• Zero