2. Atoms & Elements

Where are the reactive electrons of an atom typically located?

In what chemical form is carbon most commonly found in Earth's atmosphere?

Which planet in our solar system is believed to have helium rain in its interior?

Which of the following best describes the current composition of Earth's atmosphere by volume?

An atom has a mass number of 48 and contains 22 neutrons. How many protons does this atom have?

The smallest particle of an element that retains the properties of that element is a(n):

An element is a pure substance that contains how many kinds of atoms?

Which of the following determines the identity of an atom?

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

How many p electrons are present in a neutral atom of gallium (Ga)?

Which of the following models best helps explain the basic structure of an atom to a beginner?

What is the overall charge of the nucleus of an atom?

How many protons are present in a lithium atom?

How many protons are present in a neutral atom of vanadium?

Which of the following determines the type of element that an atom is?