2. Worksheet IV. Instructions: 1. The crossword puzzle contains terms related to atoms and atomic models that have learned about in previous lessons. Fill in the puzzle with the correct terms based on the provided descriptions. 2. Pay attention to the number of letters in each word and the intersecting letters of the adjacent words to determine the correct answers. Across: 4. Atomic model where electrons don't move around the nucleus in orbits. Electrons exist in specific energy levels as a cloud. 8. Electrons reside in orbits. They move between each shell when gaining or losing energy. 9. Negatively charged particles 10. Building block of matter that cannot be broken apart using any chemical means Down: 1. An atom is made out of a sphere of positive charges with negatively charged electron embedded in it. 2. Subatomic particle with a neutral charge 3. A tangible model. 4. Matter is made of small indivisible atoms. 5. Most of the mass is concentrated in the center of atom. This tiny, dense, positively charged core called a nucleus. 6. Positively charged particles​