Chemistry Parts of an Atom

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 

Which number here is my atomic number?

• 5
• 10.811

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NGSS.MS-PS1-1

How many protons does this atom have?

• 2.5
• 6
• 5
• 10.811

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NGSS.MS-PS1-1

How many Electrons

• 2.5
• 5
• 6
• 10.81

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NGSS.MS-PS1-1

In order for me to find the number of neutrons, I must round the atomic mass and then do what?

• atomic number-atomic mass
• atomic number x atomic mass
• atomic mass + atomic number
• atomic mass - atomic number

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NGSS.MS-PS1-1

What part of the atom is the arrow pointing to?

• nucleus
• proton
• electron shell
• electron

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

• negatrons 
• electrons 
• neutrons 
• protons 

A section of the Periodic Table of Elements is provided. What is the chemical symbol for magnesium?

• 12
• Mg
• 24.31
• Magnesium

B and C are found in the ______ of an atom.

• Energy levels
• Space
• Nucleus
• Outside

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NGSS.MS-PS1-1