Which of the following does not describe elements?

they are uniform throughout.
they can be separated by a chemical reaction.
they cannot be separated by physical means.
they are listed on the periodic table.

Option (b) is the correct answer.

Explanation:

Elements are defined as the substance which contain same type of atoms.

An element cannot be divided into simpler substances by any physical or chemical means.

For example, a piece of aluminium will contain only atoms of aluminium.

The periodic table contains all the elements present in nature.

Thus, we can conclude that out of the given options the statement they can be separated by a chemical reaction, does not describe elements.

1.solid

2.carbon dioxide

3.helium