What is chemistry? The study of matter, anything with mass that
takes up space.
What is an atom? The smallest unit of matter with unique
chemical and physical properties.
What are molecules? Matter composed of two or more atoms.
,What are compound Molecules that contain more than one type
molecules? of atom.
What are macromolecules? Large molecules formed by joining smaller
molecules together.
What are subatomic particles? Particles that make up atoms, including
protons, neutrons, and electrons.
,What are elements? Pure substances made of only one type of
atom.
How many naturally occurring 92 naturally occurring elements, with a total
elements are there? of 118 known.
What four elements make up Hydrogen, Oxygen, Carbon, and Nitrogen.
90% of the human body?
What is the atomic number? The number of protons in an atom, which
also equals the number of electrons in a
neutral atom.
, What is the mass number? The sum of protons and neutrons in an
atom.
What are isotopes? Atoms of the same element that have
differing numbers of neutrons.
What is a radioactive isotope? An unstable isotope that tends to decay
over time, releasing energy.
takes up space.
What is an atom? The smallest unit of matter with unique
chemical and physical properties.
What are molecules? Matter composed of two or more atoms.
,What are compound Molecules that contain more than one type
molecules? of atom.
What are macromolecules? Large molecules formed by joining smaller
molecules together.
What are subatomic particles? Particles that make up atoms, including
protons, neutrons, and electrons.
,What are elements? Pure substances made of only one type of
atom.
How many naturally occurring 92 naturally occurring elements, with a total
elements are there? of 118 known.
What four elements make up Hydrogen, Oxygen, Carbon, and Nitrogen.
90% of the human body?
What is the atomic number? The number of protons in an atom, which
also equals the number of electrons in a
neutral atom.
, What is the mass number? The sum of protons and neutrons in an
atom.
What are isotopes? Atoms of the same element that have
differing numbers of neutrons.
What is a radioactive isotope? An unstable isotope that tends to decay
over time, releasing energy.
