Respuesta :
A. An element is a pure substance that cannot be broken down into a simpler form.
C. All elements are listed on the periodic table of elements.
D. An element symbol begins with a capital letter; if there is a second or even third letter, it is a lowercase letter.
Explanation -
Elements are the substances that occur in the simplest form and cannot be broken down to more simpler substances as they are made up of only one kind of atom. The elements are mentioned in the periodic table. Compounds are formed when elements merges with each other.
The first letter of an element is written in upper case whereas the next letter following it is written in lower case. Elements are not denoted by a chemical formula rather they are just denoted by symbols.
