2. Atoms & Elements

Which of the following best describes the movement of atoms in a solid?

Which atomic model best describes the structure of a boron (B) atom?

Which gas makes up the largest proportion of the air that we breathe?

What is the charge of the nucleus of an atom?

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)?