8.5A The Atom Test Your Knowledge

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

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

Mathematical Equivalence

ON

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

• 72 protons, 178 neutrons, 106 electrons

• 72 protons, 106 neutrons, 72 electrons

• 178 protons, 250 neutrons, 72 electrons

• 106 protons, 72 neutrons, 106 electrons

Tags

NGSS.MS-PS1-1

In the early 1900s many scientists thought that an atom consisted of a positive substance with negative charges scattered throughout the substance. Then Ernest Rutherford completed an experiment that changed the concept of an atom. His discovery led to the understanding that an atom consists mostly of empty space with —

• protons orbiting a dense nucleus made of electrons and neutrons

• electrons orbiting a dense nucleus made of protons and neutrons

• neutrons and protons orbiting a cloud of electrons

• electrons and protons orbiting a cloud of neutrons

Tags

NGSS.HS-PS1-8

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?

Mathematical Equivalence

ON

According to the Periodic Table, which of the following is the most accurate model of an atom of boron?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

What is true about the atom

• electrons have similar mass protons mass

• electrons and neutrons have similar mass

• Protons have a much larger mass than neutrons

• Protons and neutrons have similar mass

Tags

NGSS.MS-PS1-1

How many more electrons does Sulfur have than Aluminum?

Mathematical Equivalence

ON

Tags

NGSS.MS-PS1-1

What makes up the mass of an atom

• Electrons

• Protons

• Neutrons

• Electron cloud

What is the true about protons and neutrons? ( more than one correct answer)

• They make up the nucleus

• They both have 1 AMU

• Neutrons have 0 AMU and Protons 1 AMU

• They both make up the atomic mass