Month: April 2018

Important Terms proton number = atomic number nucleon number = mass number. This term indicates the total number of protons and neutrons combined in any elements. Isotopes are elements that have the same number of protons but different number of neutrons. Key ideas From periodic table, the period number indicates the number of electron shells … Read more

Key Definition Matter: any substance (thing) that has mass and takes up space. Atoms: smallest particles of an element that have the chemical properties of that element. Element: it is a pure substance that cannot be broken down into two or more simpler substances by chemical processes. Molecule: a molecule is a group of two … Read more