The building blocks that make up all matter are
The _________is the center of the atom.
The place around the nucleus of an atom is called the
Oxygen has an atomic number of 8. This means than an atom of Oxygen has _______protons.
Carbon has an atomic number of 6. This means that an atom of Carbon has ________electrons.
List the three subatomic particles.
A proton has a positive charge.
A neutron has no charge.
An electron has no charge.
Which of the following statements best describe the basic structure of an atom?
Which of the following correctly describes a property of an atom with no charge?
Atomic theory, which describes the atoms that make up matter, have been explored for centuries. Scientists in ancient Greece first proposed that matter was made of units called atoms. For many years, scientists thought atoms were solid and could not be divided. Then, in the nineteenth century, scientists began to discover the particles that make up atoms. Modern techniques have allowed scientists to split atoms into increasingly smaller particles. Which of the following statements about theories is supported by the history of the atomic theory?