write true if the sentence is correct and false if it is not. 11. each element has a specific number of atoms in the nucleus. 12.electrons are the largest particles in an atom. 13.A quark is a small particle that makes up protons ad neutrons. 14. heat is a form of matter. 15.Atoms are mostly empty space. 16.Gasoline is the mixture of octane and hydrocarbons.. 17. covalent compound has generally low melting and boiling point. 18. Any number of atoms can be linked by covalent bond. 19.the central atom in a covalent molecule has always 8 electrons. 20.covalent compound are water soluble.
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