Atomic Theory

Air is a mixture of several different kinds of molecules.

• True
• False

The tiniest bit of water that still is water is a molecule of water.

• True
• False

Tags

NGSS.MS-PS1-1

An oxygen molecule usually has two oxygen atoms.

• True
• False

Tags

NGSS.MS-PS1-1

Hydrogen is a compound.

• True
• False

Tags

NGSS.MS-PS1-1

all matter is made of what 

• energy 
• atoms 
• electrons 
• compounds 

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

an atom with atomic number 6 would have how many protons 

• 6
• 12
• 3
• cannot be determined 

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

• nucleus 
• electron cloud
• core 
• center 

Particles in an atom that are neutral and have no charge are 

• negatrons 
• electrons 
• neutrons 
• protons 

What is the atomic number for an element with three protons?

• 2
• 1
• 3
• 6