2. Atoms & Elements

Which of the following statements is true about a neutral atom of silicon?

Which of the following best describes what an electron cloud represents in an atom?

Carbon has an atomic number of 6. What can you conclude about carbon from this fact?

Which of the following statements about a neutral atom is correct?

Silicon has an atomic number of 14 and a mass number of 28. How many neutrons does a typical atom of silicon contain?

Which of the following is considered the smallest part of an element that retains its chemical properties?

Approximately what percentage of the matter in the universe is comprised of atoms?

Which fundamental force is primarily responsible for holding together the protons and neutrons within an atom's nucleus?

Which of the following are the smallest chemical units that can combine to form molecules?

In a silica tetrahedron, the small brown sphere at the center typically represents which type of atom?

Nitric acid has the chemical formula HNO3. How many atoms of nitrogen are present in one formula unit of HNO3?

Which of the following correctly describes a neutral atom of nitrogen with a mass number of 15?

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

Which statement best describes the difference between atoms and molecules?

What is the basic unit of all matter?