Noble gases - Name given to the elements that all contain eight electrons in outer energy shell. (2 words 5, 5), Building blocks - Atoms are the b_____________ b_______ of chemistry, as cells are to biology. (2 words 8, 6), Protons - Particles found in the nucleus of an atom with a relative mass of 1 and a positive charge. (7), Stable - Atoms with a full outer energy shell are described as .......... . (6), Magnesium - Element with chemical symbol Mg. (9), Periodic table - A chart in which all the elements are arranged according to their number of protons (2 words, Atom - The smallest part of an element (4), Neutrons - Particles found in the nucleus of an atom but that have no charge. (8), Water - Compound with chemical symbol H2O . (5), Oxygen - Gas with chemical symbol O2. (6) , Ion - A charged particle. Made when an atom gains or loses an electron. (3), Hydrogen - Element that has only one proton. (8), Atomic Number - The quantity of protons in the nucleus of an atom. (2 words 6, 6), Mass - ........ Number = number of protons + number of neutrons (4), Sodium - Element with the chemical symbol Na, Ionic - Opposite charged particles from different atoms are attracted and held together in this type of bonding. (5), Molecule - Two or more atoms joined together by a chemical bond (8), Group - A vertical column containing elements with similar properties, Compound - Consists of two or more atoms from different elements chemically bonded to each other (8), Helium - Element has only two electrons, Two - Maximum number of electrons in the first energy level or shell, Nucleus - The central part of an atom, Aluminium - Element with chemical symbol Al (9), Shells - Where electrons are grouped in energy levels around an atom (6), Electron - A particle that has almost no relative mass and a negative charge (8), Covalent - A type of bond between atoms. Electrons are shared. (8), Element - A substance that cannot be split into another by any chemical means (7),
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