energy l mass number

They are imaginary regions around the nucleus in which the electrons move ......

• energy levels

• electrons

• protons

• the atoms

Atoms of inactive elements (stable)

........... chemical reactions in

ordinary conditions.

• don’t take part in

• take part in

• outer most energy level completed by electrons

• have less than 8 electrons in the outer most energy level

If an electron moves from n=4 to n=2 it ____

• absorbs energy

• releases energy

When talking about energy levels in an atom, what is an "excited state"?

• The highest energy state of an atom.
• Any level higher than the ground state.
• The lowest energy state of an atom.
• When an atom loses an electron

Where are protons found in an atom?

• The nucleus
• Energy level
• The atomic mass
• By electrons

An atom is made up of how many different types of particles?

• One

• Two

• Three

• Four

Identify the element using the model.

• He

• Li

• Be

• Na

The __________ tells you how many protons an element has.

• atomic number
• atomic mass
• energy levels
• electrons

Identify number 15 on the periodic table square below.

• atomic number

• element name

• atomic mass

• chemical symbol

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons