2. Atoms & Elements

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

How many protons are present in a single atom of sodium (Na)?

In a typical covalent compound, how many single covalent bonds can a nitrogen atom form?

Which term refers to the amount of matter in an object?

Which of the following are the very small particles that make up matter?

In the atomic symbol _{17}^{35}Cl_, which number represents the atomic number and which represents the mass number?

Which of the following particles lacks a nucleus?

Which element has 3 valence electrons and 4 energy levels?

Which of the following pure substances can be classified as an element?

Which term describes the group of protons and neutrons located at the center of all atoms?

Which of the following best describes the difference between an atom and a molecule?

Tin (Sn) has an atomic number of 50 and its most abundant isotope has a mass number of 120. How many neutrons are present in this isotope of tin?

Which part of the atom is primarily involved in chemical reactions?

Which of the following correctly identifies the three main subatomic particles found in an atom?

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