Question

which statement describes an element? check all that apply.
an element is a pure substance that cannot be broken down into a simpler form.
an element is made of two or more atoms that are chemically combined.
all elements are listed on the periodic table of elements.
an element symbol begins with a capital letter; if there is a second or even third letter, it is a lowercase letter.

Explanation:

1. For the first statement: By definition, an element is a pure substance that cannot be broken down into simpler substances by chemical means. So this statement is correct.
2. For the second statement: A substance made of two or more atoms chemically combined is a compound, not an element. Elements are made of only one type of atom. So this statement is incorrect.
3. For the third statement: The periodic table of elements lists all known chemical elements. So this statement is correct.
4. For the fourth statement: Element symbols follow the rule that the first letter is capitalized and subsequent letters (if any) are lowercase. For example, 'H' for hydrogen, 'He' for helium, 'Fe' for iron. So this statement is correct.

Answer:

• An element is a pure substance that cannot be broken down into a simpler form.
• All elements are listed on the periodic table of elements.
• An element symbol begins with a capital letter; if there is a second or even third letter, it is a lowercase letter.