Periodic Table Concepts and Structure

The video tutorial compares Mendeleev's periodic table with the modern periodic table. Mendeleev's table is based on atomic mass, while the modern table is based on atomic number. Mendeleev's table had 63 elements, whereas the modern table has 118. Hydrogen's position is fixed in the modern table but not in Mendeleev's. Isotopes and noble gases are supported in the modern table but not in Mendeleev's. The modern table has no gaps for undiscovered elements and separates transition elements, unlike Mendeleev's. The modern table also supports atomic structure concepts, allowing for easy deduction of electron configurations.

What is the basis of arrangement in Mendeleev's periodic table?

• Electron configuration

• Atomic mass

• Atomic number

• Number of neutrons

How are elements arranged in the modern periodic table?

• By increasing atomic number

• By decreasing atomic number

• By increasing atomic mass

• By decreasing atomic mass

How many elements are there in Mendeleev's periodic table?

• 108

• 92

• 118

• 63

Where is hydrogen placed in the modern periodic table?

• Group 3

• Group 1

• Group 18

• Group 2

Which periodic table supports the existence of isotopes?

• Mendeleev's periodic table

• Modern periodic table

• Both tables

• Neither table

In which group are noble gases placed in the modern periodic table?

• Group 17

• Group 1

• Group 18

• Group 2

What was the purpose of gaps in Mendeleev's periodic table?

• To separate noble gases

• To place isotopes

• For undiscovered elements

• To separate metals and non-metals

Where are transition elements placed in the modern periodic table?

• In group 1

• With other elements

• In a separate block

• In group 18

What does the modern periodic table support that Mendeleev's does not?

• Number of protons

• Number of neutrons

• Atomic structure

• Atomic mass

How many valence electrons do elements in group 2 have?

• Three

• Four

• Two

• One