Metals and Non-metals-class 7-introduction

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Across
  1. 4. Oxygen, Carbon, Nitrogen are the examples of _________.
  2. 5. the metal present in the haemoglobin of the our blood.
  3. 6. Iron, Aluminium, copper are the examples of _____.
Down
  1. 1. The group 17 elements of the periodic table.
  2. 2. the non metallic gas that we need for respiration.
  3. 3. The group I elements of the periodic table.