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Atoms of elements in group 18 (noble gases) do not easily combine with other elements to form compounds.
One of the best ways to describe John Dalton's observations of elements is that they are made of small particles. The atoms join in simple whole number ratios when the elements react.
There are very many elements which will do that.
== == When metals react with other elements, the atoms of the metals give up their valence electrons.
If the elements are mixed, but do not react, this is a mixture, or possibly a solution.If the substances chemically react to form a new substance, then it is a chemical reaction, and the substance created (through chemical bonding) is a compound.The smallest unit of a compound is a molecule, which consists of two or more atoms in a specific arrangement.(Molecules can also be made of one element, and are called allotropes.)
because they are chemically joined together and it is difficult to separate them
They form a compound.
== == When metals react with other elements, the atoms of the metals give up their valence electrons.
== == When metals react with other elements, the atoms of the metals give up their valence electrons.
Atoms of non-metals usually gain or share electrons when they react with other atoms.
== == When metals react with other elements, the atoms of the metals give up their valence electrons.
== == When metals react with other elements, the atoms of the metals give up their valence electrons.
Different elements have different valences which affect how many hydrogen atoms they will bind with.
== == When metals react with other elements, the atoms of the metals give up their valence electrons.
a compound composed of all the same elements would be a pure element. not a compound! a compound is when there is 2 or more atoms chemically bonded together. different compounds do have similar properties - they all have 2 or more atoms of elements chemically bonded together and they often react in similar way too.
Atoms of elements in group 18 (noble gases) do not easily combine with other elements to form compounds.
One of the best ways to describe John Dalton's observations of elements is that they are made of small particles. The atoms join in simple whole number ratios when the elements react.