science

• An atom is the basic unit of matter, consisting of a nucleus containing protons and neutrons, surrounded by electrons.
• solid is a substance that has a fixed shape and volume and is not a gas or a liquid
• liquid is a state of matter that has a definite volume and shape but is not solid or gas
• a gas is a substance that has no fixed shape and volume and can move freely
• plasma is an ionized gas with charged particles moving at high speeds
• an element is a pure chemical substance made up of only one type of atom
• compound is a substance formed from two or more elements chemically combined together
• the periodic table organizes elements based on their atomic number (number of protons) and electron configuration
• elements are arranged into groups based on similar properties such as valence electrons and chemical behavior
• compound is a substance composed of two or more different elements chemically combined
• chemical change is a change in the composition of a substance, but not in its physical state
• physical change is a change that can be seen with the naked eye, such as melting or boiling
• atomic number is the number of protons in the nucleus of an atom, which is equal to the number of electrons in the outermost shell
• atomic mass number is the number of protons and neutrons in an atom of an element
• proton: a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron.
• electron: a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
• neutron: a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
• protons and neutrons have a mass of 1 unit each
• electrons have no mass
• all atoms in an element are identical
• matter is anything that occupies space and has mass
• mixture: a substance made by mixing other substances together
• monatomic: consisting of one atom.
• mass: a large body of matter with no definite shape
• volume is the amount of space an object occupies
• state: the particular condition that someone or something is in at a specific time
• molecule: a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
• reactant: a substance that takes part in and undergoes change during a reaction.
• products are the result of an action or process that is used to make something else
• mass: a large body of matter with no definite shape