Atoms Crossword
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
 
 
Down: 1) A substance that cannot be broken down into any other substances by chemical or physical means.2) Small, positively charged particles that are found in the nucleus of an atom.3) Elements in the same vertical column of the periodic table also called a group.4) Anthing that has mass and occupies space.6) Two or more substances that are mixed together but not chemically combined.7) The number of protons in the nucleus of an atom8) Elements in the same horizontal row of the periodic table.9) A one- or two-letter set of characters that is used to identify an element.11) A substance made of two or more elements chemically combined in a specific ratio, or proportion.15) The force that holds atoms together.16) The central core of an atom,containing protons and usually neutrons.18) An element belonging to Group 1 of the periodic table.19) The specific amount of energy an electron has. Across: 5) The smallest particle of an element.10) A well-tested idea that explains and connects a wide range of observations.12) Physical,mental, visual, and other representations of an idea to help people understand a concept that they cannot observe directly.13) Small, uncharged particles that are found in the nucleus of an atom.14) Negatively charged particles that move around outside the nucleus of an atom.16) An element of group 18 of the periodic table.17) The electrons that are in the highest energy level of an atom and that are involved in chemical reactions.20) An element belonging to group 17 of the periodic table.21) A representation of the valence electrons in an atom using dots.
 

 

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