Chemistry

Periodic Classification and Elements

1,176 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

The statement 'An s orbital is spherical in shape', means that

  1. the probability of finding an electron, at a given distance from the nucleus in this orbital, is same in all directions.

  2. the electron density in this orbital is distributed on the surface of a sphere.

  3. the electrons in this orbital are present in the centre of a sphere.

  4. the electrons in this orbital are moving in circles inside a sphere.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The statement 'An s orbital is spherical in shape', means that the probability of finding an electron, at a given distance from the nucleus in this orbital, is same in all directions.

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.