2. Atoms & Elements

Where are the protons located within an atom?

Where are electrons located in the atom?

How many electrons are present in a single neutral atom of argon?

Which of the following compounds contains 8 unique protons in each molecule?

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?

An electron in the n=6 level of the hydrogen atom relaxes to a lower-energy level, emitting light of wavelength 93.8 nm. To which principal level did the electron relax?