year 10 chemistry Flashcards
what is a 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.
what is a 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.
what is a proton
The proton is a subatomic particle with a positive electrical charge. They are found in every atomic nucleus of every element
what is a element
A basic part of a whole. In chemistry, refers to a simple substance that cannot be broken down into smaller parts or changed into another substance.
what is a compound
substance made from two or more different elements that have been chemically joined.
what is a molocule
a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
what is atomic mass
the mass of a single atom of a chemical element.
what is the atomic number
the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.
what is a valence electron
the electrons in the outermost shell, or energy level, of an atom.
what is a periodic table
A table in which the chemical elements are arranged in order of increasing atomic number.
