Periodicity Crossword Puzzle

QUESTIONS LIST:

• period : the line across the periodic table.
• group : the column down the periodic table.
• atom : the smallest particle that makes up everything.
• element : the substances that are made of only one type of atoms.
• molecule : particles that are made of to or more atoms.
• mixture : two substances mixed together and not chemically bonded.
• compound : substances that are made of different atoms chemically bonded together.
• electron : the subatomic particle that has charge of -1 but no mass.
• proton : the subatomic particle that has charge of +1 and mass of 1.
• neutron : the subatomic particle that has no charge and mass of 1.
• ion : the particle formed when an atom gains or loses electrons.
• metal : the type of elements that are hard, shiny and are good conductors.
• non-metal : the type of elements that are usually soft, dull and good insulators.
• alkali metal : the group that can react with water to form alkali.
• group four : the group that can form very large molecules.
• halogen : the group of elements that contain solids, liquid and gases.
• noble gas : the group of elements that contain only inert gases.