The Structure of Matter

Which of the following is true about how hydrogen and oxygen can combine to form molecules?

• Hydrogen and oxygen can combine in many ways to form different molecules.
• Two atoms of hydrogen are always required to bond with two atoms of oxygen.
• When oxygen combines with hydrogen to make a molecule, water will always be produced.
• Molecules composed of hydrogen and oxygen must have at least four atoms.

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NGSS.MS-PS1-1

Which of the following best explains the relationship between molecules and atoms?

• Atoms are molecules that have a charge.
• Atoms have smaller parts, which are called molecules.
• Molecules are made up of two or more atoms.
• Molecules are atoms that have no mass.

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NGSS.MS-PS1-1

all matter is made of what 

• energy 
• atoms 
• electrons 
• compounds 

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

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 

an atom with atomic number 6 would have how many protons 

• 6
• 12
• 3
• cannot be determined 

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

• negatrons 
• electrons 
• neutrons 
• protons 

True or False? Neutrons have a negative charge

• True
• False

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

• 2
• 1
• 3
• 6

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

• Proton
• Neutron
• Electron
• Quark