Chemistry

Periodic Classification and Elements

1,092 Questions

Periodic classification organizes chemical elements based on atomic structure, periodic laws, and elemental properties. It covers historical classification systems, electron configurations, and periodic trends. Test takers preparing for chemistry sections will find these questions crucial for mastering fundamental element properties and atomic interactions.

Periodic table structureAtomic orbitalsElement identificationPeriodic laws

Periodic Classification and Elements Questions

Multiple choice

Lanthanides are elements of ___

  1. s-block

  2. p-block

  3. d-block

  4. f-block
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lanthanides are the series of elements from atomic number 57 to 71, characterized by the filling of the 4f subshell.

Multiple choice

Symbol of helium is _______.

  1. He

  2. H

  3. Hi

  4. Hl
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The chemical symbol for the element Helium is He. H is Hydrogen, and the others are not valid symbols.

Multiple choice

Which of the following statements is true about the Mendeleev’s periodic table?

  1. In Mendeleev’s periodic table, atomic masses of the elements increase in a regular manner.

  2. It was possible to predict the number of elements that could be discovered between two elements.

  3. Existence of hydrogen as a diatomic molecule was explained by the Mendeleev’s periodic table.

  4. Mendeleev used a Sanskrit numeral to name the undiscovered elements.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

From above given statements, option (4) is correct, as Mendeleev used a Sanskrit numeral to name the undiscovered elements.