Question

an atomic scientist was studying an atom and through experimentation found that the total negative charge of the area surrounding the nucleus is \\(-9\\). which statement correctly describes this atom?

• this atom has nine electrons.
• this atom has nine clouds.
• this atom has ten protons.
• this atom has nine neutrons.

Explanation:

Identify the subatomic particle responsible for negative charge

Using the Subatomic Particles knowledge point

• Electrons carry a charge of \(-1\) each.
• Protons carry a charge of \(+1\) each.
• Neutrons carry a charge of \(0\).

Determine the number of electrons from the total negative charge

Using the Atoms and Molecules knowledge point

• The area surrounding the nucleus contains the electrons.
• Total negative charge surrounding the nucleus is \(-9\).
• Number of electrons: \(\frac{-9}{-1} = 9\).

Evaluate the given statements

• "This atom has nine electrons." matches our calculation.
• "This atom has nine clouds." is incorrect.
• "This atom has ten protons." cannot be determined from the negative charge alone.
• "This atom has nine neutrons." cannot be determined from the negative charge alone.

Answer:

• This atom has nine electrons. (Correct answer)
• This atom has nine clouds.
• This atom has ten protons.
• This atom has nine neutrons.