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whose properties are intermediate between those of metals and solid non-metals or semiconductors
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no.1
Dobereiner’s triads were groups of elements with similar properties that were identified by the German chemist Johann Wolfgang Dobereiner. He observed that groups of three elements (triads) could be formed in which all the elements shared similar physical and chemical properties.
Dobereiner stated in his law of triads that the arithmetic mean of the atomic masses of the first and third element in a triad would be approximately equal to the atomic mass of the second element in that triad. He also suggested that this law could be extended for other quantifiable properties of elements, such as density.
no. 2
Metalloids are a small group of elements founds in the periodic table of elements along the zigzag line that distinguishes metals from non-metals and is drawn from between boron and aluminium to the border polonium and astatine.
no. 3
The elements in Group 18 of the periodic table are known as the noble gases. These elements are also known as the inert gases, which is a very appropriate name for them since this group of elements exhibits extremely inert chemical behaviour.