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Metals and Non-Metals — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMetals and Non-Metals3 Marks
Question
The atomic number of an element is 12.
  1. Write its electronic configuration and determine its valency.
  2. Is it more reactive or less reactive than Ca (atomic number 20)? Justify your answer giving reason.
  3. Is it a metal or a non-metal?
  4. Write the formula of its oxide.
✓

Answer

  1. X(12): 2,8,2
Valency: 2
  1. Less reactive than Ca as reactivity increases down the group.
  2. It is a metal.
  3. Formula of oxide: XO

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