Chapter 2 – Introductory
Chemistry Study Guide,
Notes, Review & Practice
Questions
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Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
, define chemistry the science of the structure and interactions of matter
Define matter Anything that has mass and takes up space
Define mass the amount of matter in an object
Define chemical elements substances that cannot be split into simpler substances by ordinary chemical
means
Define chemical symbol A one or two letter representation of an element
What are the major elements in your body? Elements that make up 96% of your body: oxygen, carbon, hydrogen, nitrogen
What are the lesser elements in your body? Elements that make up 3.6% of your body: calcium, phosphorus, potassium,
sulfur, sodium, chlorine, magnesium, iron
What are the trace elements in your body? Elements that make up 0.4% of your body: aluminum, boron, chromium, cobalt,
copper, fluorine, iodine, manganese, molybdenum, selenium, silicon, tin,
vanadium, zinc
how many elements are there? 118 elements
What are elements made of? atoms
What is an atomic number? the number of protons in the nucleus of an atom
What is the mass number? the total number of protons and neutrons in a nucleus.
What are electron shells? Regions that specific groups of electrons are most likely to be. First shell max is
2, second shell max is 8, third max shell 18.
What is an ion? an atom or molecule with a net electric charge due to the loss or gain of one
or more electrons.
What is a molecule? 2 or more atoms bonded together
Chemistry Study Guide,
Notes, Review & Practice
Questions
| Guaranteed success|
Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
, define chemistry the science of the structure and interactions of matter
Define matter Anything that has mass and takes up space
Define mass the amount of matter in an object
Define chemical elements substances that cannot be split into simpler substances by ordinary chemical
means
Define chemical symbol A one or two letter representation of an element
What are the major elements in your body? Elements that make up 96% of your body: oxygen, carbon, hydrogen, nitrogen
What are the lesser elements in your body? Elements that make up 3.6% of your body: calcium, phosphorus, potassium,
sulfur, sodium, chlorine, magnesium, iron
What are the trace elements in your body? Elements that make up 0.4% of your body: aluminum, boron, chromium, cobalt,
copper, fluorine, iodine, manganese, molybdenum, selenium, silicon, tin,
vanadium, zinc
how many elements are there? 118 elements
What are elements made of? atoms
What is an atomic number? the number of protons in the nucleus of an atom
What is the mass number? the total number of protons and neutrons in a nucleus.
What are electron shells? Regions that specific groups of electrons are most likely to be. First shell max is
2, second shell max is 8, third max shell 18.
What is an ion? an atom or molecule with a net electric charge due to the loss or gain of one
or more electrons.
What is a molecule? 2 or more atoms bonded together
