Ionic substances are held together ionic bonds, which are the electrostatic attractions between oppositely charged ions.
releases ions into the substances
Ionic substances are held together by ionic bonds which are much stronger than the inter molecular bonds that hold together molecules.
Substances held together by physical forces, not chemical
They are held together in a lattice structure by ionic bonds
In any ionic compound including magnesium chloride, the ions are held together by ionic bonds.
releases ions into the substances
Ionic substances are held together by ionic bonds which are much stronger than the inter molecular bonds that hold together molecules.
If the question is "Why do etc." then: Ions in an ionic crystal are held together by ionic bonds aka direct electrostatic interaction, a fairly strong force. Metal atoms in a metal are held together by the metallic bond, which is weaker than an ionic bond or covalent bond but still pretty strong. Molecules in a molecular crystal are held together by covalent bonds internally, but the forces between molecules are at best relatively weak interactions (London or van der Waals type forces).
Substances held together by physical forces, not chemical
Yes.
In any ionic compound including magnesium chloride, the ions are held together by ionic bonds.
They are held together in a lattice structure by ionic bonds
They are held together by either a ionic bond.
Radioactive substances consist of nuclei that can't be held together by the strong force.
No, all molecules are held together by covalent bonds.
Electromagnetic.
Ionic bonds