2. Atoms & Elements

How many electrons are present in a neutral sodium atom?

Can a single atom be considered a molecule?

Which of the following best explains why the mass spectrum of chlorine shows two major peaks at approximately 35 and 37 atomic mass units?

How many neutrons are present in a neutral atom of bromine (Br) with a mass number of 80?

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

Where is most of the mass of an atom located?

What is the atomic number of oxygen?

Why are most atoms electrically neutral?

Ag-109 has 62 neutrons. The neutral atom has how many electrons?

Which of the following is the number of protons in an atom of aluminum (Al)?

Which element is the most abundant in air and has an atomic number of 7?

Which of the following statements is true concerning the structure of the atom?

Which of the following determines the identity of an element?

Which of the following statements best describes the basic structure of an atom?

In an atom, what do electrons do in relation to protons and neutrons?