(a) what are metalloids Give two example.
(b) write the advantages and limitations of Mendeleev's periodic law. table.
Answers
Answer:
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Explanation:
A).Boron, silicon, germanium, arsenic, antimony, and tellurium are commonly recognised as metalloids. Depending on the author, one or more from selenium, polonium, or astatine are sometimes added to the list. Boron sometimes is excluded, by itself, or with silicon. Sometimes tellurium is not regarded as a metalloid.
B.)Advantages and disadvantages of mendeleev's periodic table
Grouping of elements. He generalized the study of the elements then known to a study of mere 8 groups.
Gaps for undiscovered elements. Mendeleev left some gaps in his periodic table. ...
Prediction of properties of undiscovered elements. ...
Incorrect masses corrected.
Metalloids look like metals but they are brittle like non metals. Metalloids are typically semiconductors which means that they both insulate and conduct electricity . ... Some important examples of metalloids are as follows : Boron(B), Silicon(Si) and Germanium(Ge)
Advantages
Mendeleev was the first one to establish a systematic arrangement and bring out the leave space in the periodic table.
LIMITATIONS
Elements with large differences in properties were included in the same group. for example, hard metals like copper and silver were included along with soft metals like sodium and potassium.
No proper position could be given to the element hydrogen. In the periodic table, the location of hydrogen is uncertain. It was put with alkali metals within 1A class, but certain hydrogen properties are close to those of halogens. So, it can also be put for halogens in the band.