At least one. (That's not, entirely, a smart-aleck answer. I suspect you don't understand the meaning of either element or compound or possibly both. You need some review study, and trying to figure out how "one" is a legitimate answer should provide that. As a hint, consider the diatomic gasses, or buckminsterfullerene.)
The indispensable chemical element is carbon.
the atomis mass and the atomic number is all you need
i believe combined in compounds because mostly everything is a compound.
An element is just that. One of the more than 100 elements on the Periodic table. A compound is a combination of elements. Water is 2 parts hydrogen being held together by an oxygen. Therefore water is still a compound when distilled.
A sufide is an anion form of the element sulfur. It can form compounds if it combines with other elements. Sulfide on it's own is not a compound, you need a prefix to that like Hydrogen Sulphide. Do not get this mixed up with a sulfate; you can get copper sulphate but not copper sulfide.
the atomis mass and the atomic number is all you need
The indispensable chemical element is carbon.
A compound ? im doing something familiar to this(: i have to find a compound :\ I Found NaCl But now i need to find out WHEN it was discovered & i need help :O
A compound can be separated from a mixture without being chemically altered; the separation of elements from a compound need chemical reactions.
i believe combined in compounds because mostly everything is a compound.
Hydrogen and carbon do not create a new compound by themselves. To create a new compound, they would need to bond with atoms of more elements.
It is aqua, messis and solum. all you need is reed/sugar cane and dirt.
in order for a compound to be organic it just need one or more carbon
not necessarily. A molecule is multiple atoms combined chemically, but the atoms do not need to be of different elements. A compound is several elements combined chemically though.
A compound is not lighter than an element, if that element is part of the compound. Some compounds, like H2O would be lighter than, say, the element lead, but it is not lighter than the elements that make it up, i.e. hydgrogen and/or oxygen.
It's called a compound. If you need any help just ask someone!
When metals combine with non-metals you normally get an ionic compound. So, sodium chloride is ionic. When non-metals combine with other non-metals you get a covalent type of compound, so water is covalent. If you really want to distinguish between the two you need to become familiar with the Periodic Table of Elements.