Periodic Table Concepts and Trends

Teacher Maira introduces the lesson on the periodic table, covering its historical development, structure, and classification of elements. The video explains the arrangement of elements in groups and periods, and discusses periodic trends such as atomic radius and electronegativity. The lesson concludes with a summary of key concepts.

Who is known as the father of the modern periodic table?

• Antoine Lavoisier

• Johann Wolfgang Döbereiner

• Henry Moseley

• Dmitri Mendeleev

Which scientist proposed the law of octaves?

• Lothar Meyer

• Henry Moseley

• John Newlands

• Dmitri Mendeleev

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

• Atomic mass

• Atomic number

• Electron configuration

• Chemical properties

What does each cell in the periodic table typically contain?

• Element symbol, atomic mass, electron configuration

• Element name, atomic number, electron configuration

• Atomic number, element symbol, element name, atomic mass

• Atomic mass, element symbol, group number

Which group in the periodic table is known for being highly reactive and electropositive?

• Alkali metals

• Noble gases

• Halogens

• Transition metals

Which group is characterized by having three valence electrons?

• Nitrogen family

• Carbon group

• Boron group

• Alkali metals

What are the elements called that have properties of both metals and non-metals?

• Metalloids

• Noble gases

• Alkali metals

• Halogens

Which series is found at period 6 of the periodic table?

• Actinide series

• Lanthanide series

• Transition metals

• Noble gases

Which of the following is a trend observed in the periodic table?

• Electronegativity increases across a period

• Metallic character increases across a period

• Atomic radius decreases down a group

• Ionization energy decreases across a period

Which element has a larger atomic radius: sodium or potassium?

• Cannot be determined

• They have the same atomic radius

• Potassium

• Sodium