2. Atoms & Elements

Which of the following is the atomic number of sodium?

Which gas makes up approximately 21% of Earth's atmosphere?

Which of the following statements is true about atoms?

Which of the following statements correctly describes the atomic number of an element?

A carbon atom has a mass number of 12 and an atomic number of 6. How many neutrons does it have?

Which of the following is the smallest particle of an element that retains the chemical properties of that element?

Which of the following best describes the charge of an electron?

In an atom, where are electrons primarily located?

An atom has 15 protons and 14 neutrons. What is the atomic number of this atom?

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

What is the charge of an atom's nucleus?

How many electrons are present in a neutral atom of potassium (K)?

Which statement best describes the structure of atoms?

Which of the following best describes the charge of an electron?

How many protons are present in the nucleus of an atom with atomic number 15?