Understanding Isotopes and the Periodic Table

What is the primary purpose of the periodic table as introduced in the video?

• To list all known compounds

• To organize elements by their atomic mass

• To provide a visual representation of chemical reactions

• To help understand isotopes

How is the atomic number of an element significant?

• It identifies the element by its number of protons

• It shows the element's reactivity

• It determines the element's color

• It indicates the number of neutrons

What happens if the number of protons in an atom changes?

• The atom loses its charge

• The atom becomes a different element

• The atom becomes a different isotope

• The atom remains the same element

How is the mass number of an atom calculated?

• By adding the number of protons and electrons

• By multiplying the number of protons and neutrons

• By subtracting the number of neutrons from protons

• By adding the number of protons and neutrons

Which of the following elements has a mass number of 12?

• Helium

• Oxygen

• Carbon

• Nitrogen

What defines isotopes of the same element?

• Different numbers of neutrons

• Different numbers of protons

• Different numbers of electrons

• Different atomic numbers

Which isotope of hydrogen is more stable?

• Both are equally stable

• Hydrogen-2

• Hydrogen-1

• Neither is stable

How is the hyphen notation for isotopes written?

• Element name followed by atomic number

• Element name followed by mass number

• Element symbol followed by mass number

• Element symbol followed by atomic number

What does the average atomic mass of an element indicate?

• The mass of the lightest isotope

• The weighted average of all isotopes

• The exact mass of the most common isotope

• The mass of the heaviest isotope

Which isotope of carbon is the most common in nature?

• Carbon-13

• Carbon-11

• Carbon-14

• Carbon-12