Atoms with more than 4 valence electrons tend to gain electrons to achieve a stable configuration, forming negative ions ...

Multiple Choice Questions (MCQs) on Periodic Classification of Elements of CBSE Class 10 Science are provided here with answers and their explanation. These questions are good to practice the ...

Here you get the CBSE Class 10 Science chapter 5, Periodic Classification of Elements: NCERT Exemplar Problems and Solutions (Part-III). This part of the chapter includes solutions for Question No.42 ...

Elements in group 1 and group 2 are metals. Atoms of group 1 elements have one electron in their outer shell, and atoms of group 2 elements have two electrons in their outer shell. Elements in groups ...

In an international first, scientists have produced a Bose-Einstein condensate of the alkaline-earth element strontium. Choosing the isotope 84Sr, which has received little attention so far, proved to ...