Compounds and Atoms
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Atoms join together through chemical bonds to form compounds with different properties than the original elements. When elements react, their atoms form ionic or covalent bonds. In ionic bonds, metals donate electrons to nonmetals to form positive and negative ions that attract each other. In covalent bonds, nonmetal atoms share electrons to form molecules that fill their outer shells. The properties of compounds are different than the starting elements because of the new electronic structures from bonding.
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Compounds and Atoms
- 1. Compounds Atoms join together to make Compounds 1.When different elements react,atoms form chemical bonds with other atoms to form compounds. It’s usually difficult to separate the two original elements out again. 2.Making bonds involves atoms giving away,taking or sharing electrons.Onlythe electrons are involved - it’s nothing to do with the nuclei of the atoms at all. 3.A compound which is formed from a metal and a nonmetal consists of ions.The metal atoms lose electrons to form positive ions and the nonmetal gains electrons to form negative ions.The opposite charges (positive and negative) of the ions mean that they’re strongly attracted to each other.This is called IONIC bonding. 4.A compound formed from nonmetals consists of molecules.Each atom shares an electron with another atom-this is called a COVALENT bond.Each atom has to make enough covalent bonds to fill up their outer shell. 5.The properties of a compound are totally different fromthe properties of the original elements. For example,if iron (a nice yellow powder) react ( a