Helium atoms are single atoms. The atoms of elements such as hydrogen, nitrogen and oxygen join in pairs to make molecules. Water is made of molecules.

NCERT Class 9 Science Book: Download the latest NCERT Class 9 Science Book PDF (2025-26) in Hindi and English. Get chapter-wise free PDFs for both mediums, updated as per the new NCERT syllabus.

Download CBSE Class 9 Science Assertion and Reasoning Questions PDF for Biology (Tissues), Physics, and Chemistry. Get chapter-wise assertion reason questions for Chapter 1, Chapter 2, etc.

CO₂ Carbon dioxide molecules are made up of two elements - carbon (black atoms) and oxygen (red atoms). Carbon dioxide has a specific ratio is one carbon atom to two oxygen atoms.

In a first, scientists have recreated the formation of the first ever molecules in the universe to learn more about early star formation.

News News: The CBSE has approved the introduction of open-book assessments for Class 9 students from the 2026-27 academic session. The decision follows a success ...

Atomic and molecular collision processes are the physical interactions of atoms and molecules when they are brought into close contact with each other and with electrons, protons, neutrons or ions.

Kazuo Takimiya (Hiroshima University, Japan) reported on a series of fused-ring compounds in which this has been achieved by incorporating sulphur atoms in the centre of the molecules (Fig. 1) 1.

The Board of Intermediate and Secondary Education (BISE) Lahore and BISE Faisalabad have confirmed that the 9th class results 2025 will be officially announced tomorrow, August 20, at 10:00 AM ...

CBSE Open Book Exams: Students can refer to textbooks, class notes, and approved resources during the assessments.

Class Profile A truly diverse student body — in experience, nationality, interests, and ambitions — is the foundation of the Harvard Business School experience.