TEST REVIEW-Atomic Structure 8.5A

What is the mass number of potassium (K) atom that has 20 neutrons?

• 18
• 20
• 39

Tags

112.20.b.5.A

An element's identity is determined by the number of

• electrons.
• protons.
• neutrons.
• valence.

Tags

112.20.b.5.A

A model of a carbon atom is shown below. What types of particles are found in the cloud surrounding the atom’s nucleus?

• Positively charged particles only

• Neutral particles and positively charged particles

• Positively charged particles and negatively charged particles

• Negatively charged particles only

Tags

112.20.b.5.A

Which subatomic particles contribute the most to the mass of an atom?

• Protons, Neutrons, Electrons
• Protons only
• Protons and Electrons
• Protons and Neutrons

Tags

112.20.b.5.A

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

• Electrons and protons orbiting a cloud of neutrons

• Electrons orbiting a dense nucleus filled with protons and neutrons

• Protons orbiting a dense nucleus filled with electrons and neutrons

• Neutrons and protons orbiting a cloud of electrons

Tags

112.20.b.5.A

What is the difference between the number of electrons in an atom of Iron, Fe, and the number of electrons in an atom of Carbon, C?

• 26

• 20

• 12

• 6

Tags

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?

• 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

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?

Mathematical Equivalence

ON

Tags

112.20.b.5.A

The atomic number of Lithium is 3. If the mass number of a Lithium atom is 7, which table shows the number of subatomic particles inside and outside the nucleus of the Lithium atom?

• 
• 
• 
• 

Tags

112.20.b.5.A

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

• 
• 
• 
• 

Tags

112.20.b.5.A