How many electrons would be in energy level 3 for an atom of aluminum? (13 total electrons)

• 2
• 8
• 13
• 3

What are atoms of the same element with different masses called?

• elements
• atoms
• isotopes
• compounds

all matter is made of what 

• energy 
• atoms 
• electrons 
• compounds 

Tags

NGSS.MS-PS1-1

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

the central region of an atom where its neutrons and protons are is its 

• nucleus 
• electron cloud
• core 
• center 

Tags

NGSS.MS-PS1-1

A particle that moves around the nucleus is a(n)...

• Proton
• Neutron
• Electron
• Quark

Tags

NGSS.MS-PS1-1

What is the word for all reactions in the body?

• cell respiration
• enzyme action
• metabolism
• homeostasis

The particles that are found in the nucleus of an atom are

• neutrons and electrons
• electrons only
• protons and neutrons
• protons and electrons

Covalent compounds

• Share electrons
• transfer electrons
• contain a sea of electrons
• conduct electricity

A compound that consists of positive and negative ions

• proton
• ionic bond
• density (D)
• ionic compound