CLASS VII ATOM AND MOLECULE QUIZ

ATOM AND MOLECULE QUIZ

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

Molecules are made up of . Atoms can be similar or . Oxygen molecule is made up of atoms. molecule is made up of two hydrogen atoms and one oxygen atom. An atom is the smallest unit of . The main sub- particles of atom are ,proton, and electron. Neutrons are in charge. protons have positive and have negative charge. Molecule is made of s bonded together.When an atom electron it becomes positive ion. When an atom gains one electron it becomes ion.