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To become an ion a calcium atom would have to lose 2 electrons.
Molecular compound is used to describe elements that are covalently bonded
whereas covalent compounds generally consist of molecules, which are groups of atoms in which one or more pairs of electrons are shared between bonded atoms. In a covalent bond, atoms are held together by the electrostatic attraction between the positively charged nuclei of the bonded atoms and the negatively charged electrons they share.
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