Atoms and Elements

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What is an element?

Back

An element is a substance that consists of only one type of atom.

Front

What is atomic mass?

Back

Atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

What is atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

How many protons does an oxygen atom have?

Back

An oxygen atom has 8 protons.

Front

What is the atomic mass of Silicon (Si)?

Back

The atomic mass of Silicon (Si) is approximately 28 amu.

Front

How many electrons does an atom of sulfur (S) have?

Back

A sulfur atom has 16 electrons.

Front

What is the relationship between atomic number and electrons in a neutral atom?

Back

In a neutral atom, the number of electrons equals the number of protons, which is the atomic number.

Front

What is the significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties.

Front

What are isotopes?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.