We find that it is the 4s orbital electrons that are ionised first before the 3d orbitals. We have to conclude that, ironically for the d-block elements, the 4s orbitals are in fact higher in energy ...

In contrast, P-type semiconductors use a dopant element from group III on the periodic table (such as boron, indium, or gallium). These elements have only three electrons in their valence shell ...

The periodic table is central to our understanding and classification of the world around us. The power of the periodic table lies not in the fact that it contains all known elements, but in that the ...

His idea was at first ridiculed, but became prominent when in 1869 Mendeleeff and independently Lothar Meyer presented the socalled “natural system” or periodic system of the elements.

Periodic Table as Arranged by Mendelejeff attention ... consist of a positively charged nucleus surrounded by a system of electrons which are kept together by attractive forces from the nucleus.

The periodic table of elements (often known simply as the periodic table) has been helping scientists with their work for a little over 150 years. The handy visual reference guide organizes known ...

Check here the JEE Mains 2025 Chemistry study strategy PDF. Get notes, important chapters for Class 11 and 12, easy and ...

These are almost one-quarter of the periodic table and are mainly found in the first four periods. Of these, 11 are essential elements that our bodies need in larger amounts: oxygen, carbon ...

frameborder="0″ allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen> We refer ...