Chemistry

Atoms of the same elements with different mass numbers are called isotope of each other.

If the elements are arranged according to their atomic mass then characteristic similarities can be seen in every eighth element.

Flux is added to the ores to remove mineral impurities. At high-temperature metallic oxides of ores reduce and be free as metal and flux join with impurities and form metal slag. 

In an atom, around the nucleus, there are some circular stable axes on which electron moves around. They are called energy level or orbit.

Chemically similar every three elements have atomic mass such that the middle one has the atomic mass of about the average of the other two – this is the Triads Law.

The change of material property with the successive change of period and group in the periodic table is termed as the periodicity of elements.

The electrons at the outermost principal energy level of an element are called the valence electrons of that element.

Elements of Group-3 to Group-12 of the periodic table are known as transition elements.