Periodic Table Concepts and Properties

The video tutorial introduces the periodic table, explaining its historical development and the modern periodic law. It describes the arrangement of elements into periods and groups based on electronic configuration and atomic numbers. The concept of periodicity is discussed, highlighting the recurrence of similar properties among elements. The video also covers trends in atomic size, ionization potential, electron affinity, and electronegativity across periods and groups. Finally, it explains the relationship between atomic number and atomic mass, emphasizing the role of protons and neutrons in the nucleus.

Who prepared the first periodic table based on atomic weights?

• Dmitri Mendeleev

• Henry Moseley

• John Dalton

• Niels Bohr

What is the basis for the arrangement of elements in the modern periodic table?

• Chemical properties

• Atomic weights

• Physical properties

• Atomic numbers

How many periods are there in the modern periodic table?

• 8

• 7

• 6

• 5

What is periodicity in the context of the periodic table?

• The increase in atomic mass

• The random arrangement of elements

• The recurrence of similar properties at regular intervals

• The decrease in atomic number

Which property decreases across a period from left to right?

• Metallic character

• Electron affinity

• Non-metallic character

• Ionization potential

What is the term for the energy required to remove an electron from an atom?

• Atomic radius

• Electronegativity

• Electron affinity

• Ionization potential

Which property increases across a period due to an increase in nuclear charge?

• Metallic character

• Atomic mass

• Atomic size

• Ionization potential

What is the tendency of an atom to attract electrons in a compound called?

• Ionization potential

• Electronegativity

• Electron affinity

• Atomic radius

What is the atomic number of an element?

• The number of neutrons

• The total number of electrons

• The number of protons

• The sum of protons and neutrons

How is atomic mass calculated?

• Number of electrons

• Number of neutrons

• Number of protons

• Sum of protons and neutrons