Structure of Atoms

Which statements best describe the charges on the particles in this model?

• Both particles X and Y have a positive charge.

  Particle Z has a negative charge.

• Both particles X and Y have a negative charge.

  Particle Z has a positive charge.

• Either particle X or particle Y has a positive charge.

  Particle Z has a negative charge.

• Either particle X or particle Y has a negative charge.

  Particle Z has a positive charge.

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112.20.b.5.A

Which particle has a negative charge?

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112.20.b.5.A

If a fluorine atom has a mass number of 19, how many neutrons are in the atom?

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112.20.b.5.A

How many neutrons are in the nucleus of a potassium atom with a mass number of 39?

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112.20.b.5.A

The atomic number of krypton is 36. If the mass number of krypton atom is 84, which table shows the number of subatomic particles inside and outside the nucleus of the krypton atom?

• 
• 
• 
• 

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112.20.b.5.A

A zinc, Zn, atom contains 30​ ​ (a)   inside the nucleus and 30​ (b)   outside the nucleus.

• protons
• electrons
• negatrons
• preteens

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112.20.b.5.A

Which statement correctly describes the location and charge of the electrons in an atom?

• The electrons are inside the nucleus and have no charge

• The electrons are outside the nucleus and have no charge

• The electrons are inside the nucleus and have a negative charge

• The electrons are outside the nucleus and have a negative charge

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112.20.b.5.A

What is the total number of protons, neutrons, and electrons in cadmium, Cd, atom that has a mass number of 112?

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112.20.b.5.A

What is the difference between the number of electrons in an atom of selenium, Se, and the number of electrons in an atom of aluminum, Al?

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112.20.b.5.A

How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?

​ (a)   protons, ​ (b)   neutrons, 72 ​ (c)  

• 72
• 106
• electrons
• 178
• 250

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112.20.b.5.A