There's a new record holder for the most accurate clock in the world. Researchers at the National Institute of Standards and ...

Nowadays, the prevailing of 5G communication era has greatly stimulated a tremendous progress in microwave devices and has also made a demand of more ...

Syllabus: The NTA has put the official JEE Main 2026 Syllabus online on their website: jeemain.nta.nic.in. If you're planning to take the JEE Main 2026 exam, you can find the full syllabus there. It ...

Sample preparation is the critical step of any analytical protocol, and involves steps from simple dilution to partial or total dissolution. The methods include dry or wet decomposition of the samples ...

Modern periodic law and present form of the periodic table, s, p. d and f block elements, periodic trends in properties of elements of atomic and ionic radii, ionization enthalpy, electron gain ...

NEET UG 2025 Syllabus Announced: The National Medical Commission (NMC) released the NEET UG 2025 syllabus, covering Physics, Chemistry, and Biology. The Undergraduate Medical Education Board urges ...

A hands-on experiment to obtain atomic and ionic radii with lumps of metal and ionic compounds is reported here. The experiment is performed with industrial-grade typical metals (iron, copper, ...

The atomic and ionic radii of these elements are said to decrease despite the atomic number increasing, much like other groupings in the periodic table.

In particular, the scientists were interested in promethium’s behavior as part of the lanthanide contraction—a phenomenon in which the lanthanides’ atomic and ionic radii decrease more than ...