Elements

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together. For example, water (H2O) is a compound made of hydrogen and oxygen.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Each element is made up of atoms of the same type.

Front

What is the smallest unit of an element?

Back

The smallest unit of an element is an atom.

Front

What is the smallest unit of a compound?

Back

The smallest unit of a compound is a molecule.

Front

What is a chemical symbol?

Back

A chemical symbol is a one or two-letter abbreviation used to represent an element. For example, 'H' stands for hydrogen and 'O' stands for oxygen.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is the smallest unit of a compound, made up of two or more atoms bonded together.

Front

Can a compound be made of the same element?

Back

No, a compound must consist of two or more different elements. For example, O2 is a molecule but not a compound because it consists of only one type of element (oxygen).

Front

What is an example of a compound?

Back

An example of a compound is sodium chloride (NaCl), which is table salt made from sodium and chlorine.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of all known elements, organized by their atomic number, electron configuration, and recurring chemical properties.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. For example, a salad is a mixture of different vegetables.