Exploring Isotopes and Their Properties

The video explains that all atoms of an element have the same atomic number, meaning the same number of protons. However, atoms can have different mass numbers due to varying numbers of neutrons, leading to isotopes. Isotopes are defined as atoms with the same number of protons but different numbers of neutrons. The video uses Carbon-12 and Carbon-14 as examples to illustrate isotopes, showing how they have the same atomic number but different masses due to differing neutron counts. It also mentions other isotopes like Hydrogen and Chlorine. Despite having different masses, isotopes have identical chemical properties because these are determined by electrons, not neutrons.

What does the atomic number of an element represent?

• The number of neutrons

• The mass number

• The number of protons

• The number of electrons

What is the mass number of an atom?

• The number of protons plus electrons

• The number of protons plus neutrons

• The number of protons only

• The number of neutrons plus electrons

What defines isotopes of an element?

• Same number of protons, different number of neutrons

• Same number of neutrons, different number of protons

• Same number of electrons, different number of protons

• Same number of neutrons, different number of electrons

Why are Carbon and Nitrogen not considered isotopes?

• They have the same mass number

• They have different numbers of protons

• They have different numbers of neutrons

• They have the same number of neutrons

How many neutrons does Carbon-12 have?

• 6

• 8

• 12

• 14

How many neutrons does Carbon-14 have?

• 6

• 12

• 8

• 14

Which of the following is NOT an example of isotopes?

• Chlorine-35 and Chlorine-37

• Hydrogen and Deuterium

• Carbon-12 and Carbon-14

• Carbon and Nitrogen

What do isotopes of an element have in common?

• Same mass number

• Same number of electrons

• Same number of neutrons

• Same number of protons

Why do isotopes have the same chemical properties?

• Because they have the same number of neutrons

• Because neutrons affect chemical behavior

• Because they have the same number of electrons

• Because they have the same number of protons

What controls the chemical behavior of an element?

• Mass number

• Electrons

• Neutrons

• Protons