2. Atoms & Elements

Which statement best describes the difference between the orbit model and the electron cloud model of the atom?

Which of the following best defines an element?

Which term describes a pure substance that is made up of only one type of atom?

Is it accurate to say that a textbook is about 99.9 percent empty space, based on the structure of atoms?

Which element has exactly 3 protons in its nucleus?

How many protons are present in an atom of the element cobalt (Co)?

How many protons are present in a neutral carbon atom?

Which of the following best describes the overall charge of the nucleus of an atom?

Which of the following is true of both chlorine and sodium atoms?

Where are the neutrons located in the atom?

How many protons are present in an atom of antimony (Sb)?

Which one of the following is the most abundant gas in Earth's atmosphere?

What is the mass number for an atom of xenon containing 54 protons and 76 neutrons?

How many protons are present in a neutral atom of magnesium?

Which of the following best describes the electric charge of an electron?