2. Atoms & Elements

Which part of the atom determines the identity of an element?

Which part of an atom is mostly empty space?

Which of the following is the atomic number of gold (Au)?

How many electrons are present in a neutral silicon (Si) atom?

The atomic number of boron is 5. What is the mass number of a boron atom that contains 4 neutrons?

Which element is a metalloid and has 14 neutrons in its most common isotope?

How many protons are present in an atom of Zn?

Which statement best describes an atomic nucleus?

In a typical diagram of an atom, label A points to the dense central region, and label B points to the surrounding cloud. What do labels A and B most likely represent?

Which of the following is the fundamental unit of matter?

How many different types of atoms are present in one molecule of oxygen gas (O_2)?

How many core electrons does an atom of beryllium (Be) contain?

The mass number of Fe^{2+} is 56. How many neutrons are present in a single Fe^{2+} atom?

How many protons are present in a carbon-12 atom?

Which subatomic particle primarily determines the chemical and electrical properties of an atom?