2. Atoms & Elements

Silicon has an atomic number of 14 and a mass number of 28. How many neutrons are found in a silicon atom?

Where is most of the mass of an atom located?

Manganese has an atomic number of 25 and a mass number of 55. How many neutrons does a typical atom of manganese contain?

Which of the following statements best describes the structure of matter at the atomic level?

What is located on the outside of an atom?

Which statement best describes electrons in an atom?

Which of the following acts like fingerprints that identify atoms and molecules?

The chemical characteristics or reactivity of an element depend mostly on the:

The form of oxygen that combines three oxygen atoms into each molecule is called _____.

Which of the following best describes the formation of electron clouds in an atom?

How many protons are present in a neutral atom of silver (Ag)?

Which of the following best describes the movement of atoms in a solid?

Which atomic model best describes the structure of a boron (B) atom?

Which gas makes up the largest proportion of the air that we breathe?

What is the charge of the nucleus of an atom?