Question

Which of these chemical formulasNaCl, O2, He, or SO2represents both an element and a molecule?

NaCl

O2

He

SO2

Answer 1

do you know your definitions?

Answer 2

yup

Answer 3

i think its s02

Answer 4

you'd be wrong

Answer 5

mol·e·cule (ml-kyl)
n.
1. The smallest particle of a substance that retains the chemical and physical properties of the substance and is composed of two or more atoms; a group of like or different atoms held together by chemical forces.

What is an Element?

An element is a substance consisting of atoms which all have the same number of protons - i.e. the same atomic number.

Elements are chemically the simplest substances and hence cannot be broken down using chemical methods. Elements can only be changed into other elements using nuclear methods.

Although an element's atoms must all have the same number of protons, they can have different numbers of neutrons and hence different masses. When atoms of the same element have different numbers of neutrons, they are called isotopes.