Periodic Basics

What does the number in the top left corner represent?

• protons

• neutrons

What does the number under the symbol represent?

• atomic number

• atomic mass

• electron structure

What number tells us how many electrons would be in a neutral atom?

• mass number

• atomic number

What are the electrons in the outermost energy level called?

• valence electrons

• octet electrons

• energy levels

Each column in the periodic table is called a 

• period
• group
• cluster
• unit

The atomic number tells you what?

• number of electrons
• number of protons
• number of neutrons
• both electrons and protons in an atom.

Which group of the periodic table is composed of inert (not reactive)  gases?

• alkali metals
• alkaline earth metals
• halogens
• noble gases

A horizontal row of elements in the periodic table.

• column
• group
• period

Elements in a ..................have similar chemical properties.  

• period
• group
• row

A proton is....

• A negatively charged subatomic particle
• A positively charged subatomic particle
• A neutrally charged subatomic particle
• The only subatomic particle located in the nucleus