Unit 1 Review Test

Front

What is the chemical symbol for Lithium?

Back

Li

Front

What are columns in the Periodic Table called?

Back

Groups/Families

Front

What does it mean when we say the universe is expanding?

Back

The amount of space between galaxies is increasing.

Front

What happens in a nucleus during gamma decay?

Back

There are no changes in particles.

Front

What are two pieces of evidence for our current theory of the universe?

Back

redshift, CMB

Front

What is the chemical symbol for Hydrogen?

Back

H

Front

What is the chemical symbol for Helium?

Back

He

Front

What is the difference between a period and a group in the Periodic Table?

Back

Periods are horizontal rows, while groups are vertical columns.

Front

What is redshift?

Back

Redshift is the phenomenon where light from an object is shifted to longer wavelengths, indicating that the object is moving away from the observer.

Front

What is the Cosmic Microwave Background (CMB)?

Back

The CMB is the afterglow radiation from the Big Bang, filling the universe.