Its 2-chlorobutanal
hope that helps
atom: The smallest possible amount of matter which still retains its identity as a chemical element, consisting of a nucleus surrounded by electrons.
proton: Positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element. It weighs 1 amu.
neutron: A subatomic particle forming part of the nucleus of an atom. It has no charge. It is equal in mass to a proton or it weighs 1 amu.
Answer:
Mixtures are not chemically united, so they can be divided using physical methods.
Sand is a mixture. (Because different rocks have different chemical compositions.)
Explanation: