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Periodic Classification of Elements — Science STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements5 Marks
Question
Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka - aluminium, and eka - silicon.
  1. Name the element which has taken the place of $(i)$ eka - aluminium, and $(ii)$ eka - silicon.
  2. Mention the period/ periods of these elements in the modern periodic table.
  3. Write the group/ groups of these elements in the modern periodic table.
  4. Classify these elements as metals, non - metals or metalloids.
  5. How many valence electrons are present in the atoms of each of these elements$?​​​​​​$
✓

Answer

  1.  
  1. Gallium.
  2. Germanium.
  1. $4^{th} $  period.
  2. Gallium: $13^{th} $ group; Germanium: $14^{th} $ group.
  3. Gallium: Metal; Germanium: Metalloid.
  4. Gallium: $3;$ Germanium$: 4.$

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