Structure of an atom

Front

What is the Big Bang Theory?

Back

The Big Bang Theory states that all of the matter in the Universe exploded from a tiny, dense point called a singularity.

Front

How are elements in the Periodic Table arranged?

Back

Elements in the Periodic Table are arranged in order of increasing atomic number.

Front

How old is the universe?

Back

The universe is approximately 13.8 billion years old.

Front

What confirmed our theory of the universe?

Back

The discovery of cosmic microwave background radiation confirmed our theory of the universe.

Front

What do elements in the same group have in common?

Back

Elements in the same group have similar properties.

Front

What is an atom?

Back

An atom is the basic unit of a chemical element, consisting of a nucleus surrounded by electrons.

Front

What are protons?

Back

Protons are positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutrons are neutral particles found in the nucleus of an atom.

Front

What are electrons?

Back

Electrons are negatively charged particles that orbit the nucleus of an atom.

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.