2. Atoms & Elements

How many protons does a lithium atom have?

Gold is classified as an element. What does an element of gold contain?

How many total electrons are present in a molecule of water (H_2O)?

If atom X has an atomic number of 74, which of the following statements is correct?

The lowest allowable energy state of an atom is called its:

In chemistry, when a chemist refers to the smallest unit of an element that retains the properties of that element, what is being defined?

Which of the following correctly defines one of the components of an atom?

Which of the following best describes an element?

Where is most of the mass of an atom located?

What is the atomic number of carbon?

Which of the following determines the atomic number of an element?

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

How many protons does an atom of lithium have?

Which subatomic particle determines the identity of an element?

Which pair of elements has atomic numbers that add up to 200?