1. A pure substance containing only one kind of atom. An element can't be separated into simpler substance (except during nuclear reactions). Over 100 existing elements are listed an classified on the periodic table.
Compounds
2. A pure substance containing two or more kinds of atoms. The atoms are Chemically combined in some way. Often times they come together to form groups of atoms called molecules. Compounds can't be separated by physical means. Separating a compound requires a chemical reaction. The properties of a compound are usually different than the properties of the elements it contains.
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Answer:
Elements
1. A pure substance containing only one kind of atom. An element can't be separated into simpler substance (except during nuclear reactions). Over 100 existing elements are listed an classified on the periodic table.
Compounds
2. A pure substance containing two or more kinds of atoms. The atoms are Chemically combined in some way. Often times they come together to form groups of atoms called molecules. Compounds can't be separated by physical means. Separating a compound requires a chemical reaction. The properties of a compound are usually different than the properties of the elements it contains.
Explanation:
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Answer:
number 1
1.atoms
2,cannot
3.periodic table
number 2
1.atoms
2.chemichally
3.cannot
4.elements