2. Atoms & Elements

In an atom, what occupies the space between the nucleus and the electrons?

What is the atomic number of oxygen?

Which of the following is the name of a gas composed of molecules containing three oxygen atoms?

Which of the following statements about the particles in a material is true?

A certain atom has 26 protons, 26 electrons, and 30 neutrons. What is its mass number?

Which of the following diagrams correctly represents the charges of the subatomic particles in a neutral beryllium atom?

Which of the following best describes an atom?

An atom has 19 protons and 21 neutrons. What is its mass number?

Which is the smallest part of an element that retains all of the properties of the element?

Which of the following best describes a synthetic element?

If an atom has 35 protons in its nucleus, which element is it?

Calcium has an atomic number of 20 and an atomic mass of 40. Therefore, a neutral calcium atom must have:

In a water molecule (H_2O), which atom carries a partial negative charge?

Which subatomic particle can be used to identify an atom as belonging to a specific element?

Which statement best describes the distribution of charge in an atom?