THE SRTUCTURE OF THE ATOM

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

• negatrons 
• electrons 
• neutrons 
• protons 

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

• nucleus 
• electron cloud
• core 
• center 

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The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

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all matter is made of what 

• energy 
• atoms 
• electrons 
• compounds 

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What does the nucleus of an atom contain?

• Electrons and neutrons
• Protons and neutrons
• Neutrinos and positrons
• DNA and RN

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Of the three subatomic particles, which is the smallest and the lightest?

• protons 
• neutrons
• electrons
• They are all equal.

Most of the mass in an atom is made up of _____________________?

• protons and electrons
• protons and neutrons
• neutrons and electrons
• electrons and quarks

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An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?

• 15

• 31

• 16

• 47

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What carries no charge 

• Neutrons
• Electrons
• Protons

What is the Atomic Mass?

• 6.941
• 7
• 3
• 6

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