Ionic crystal is a class of crystal consisting of a lattice of ions held together by electrostatic interactions; they exhibit strong absorption of infrared radiation and have planes along which they cleave easily. crystal latticeA regular three-dimensional geometric arrangement of atoms, molecules, or ions in a crystal.Hope it's help
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Potassium and sodium because they are highly reactive metals and can react with air to produce flame. That's why they are kept under kerosene oil
sternum is correct ok thanks
calcium reacts less violently with water and bubbles of a hydrogen gas stick to it surface .
of nitto ethane