Atoms

Front

What is the atomic number of an atom and what does it represent?

Back

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

Front

How many protons are in an atom with atomic number 6?

Back

6 protons.

Front

Where is most of the mass of an atom concentrated?

Back

Most of the mass in an atom is concentrated in the nucleus.

Front

What are the positive particles in an atom called?

Back

Protons.

Front

How are elements arranged in the modern periodic table?

Back

Elements are arranged by atomic number.

Front

What is the atomic symbol for sodium?

Back

Na.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

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

Back

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