Atoms

4. Atoms of the same element that have different numbers of neutrons.
6. Substances formed as a result of a chemical reaction.
7. A chemical reaction that releases energy in the form of heat or light.
9. A vertical column in the periodic table with elements that have similar properties.
11. A negatively charged subatomic particle that orbits the nucleus.
12. Number The number of protons in the nucleus of an atom, determining the element.
15. Reaction A process where substances change to form new substances.
18. The electrons in the outermost shell of an atom, which determine bonding.

1. A chemical bond formed by sharing electrons between atoms.
2. A chemical bond formed by the transfer of electrons between atoms.
3. Number The total number of protons and neutrons in an atom's nucleus.
5. A chemical reaction that absorbs energy during the process.
6. A positively charged subatomic particle found in the nucleus of an atom.
8. A subatomic particle with no charge, located in the nucleus of an atom.
10. Table A chart that organizes elements based on atomic number and properties.
12. The smallest unit of matter that retains the properties of an element.
13. The dense center of an atom containing protons and neutrons.
14. Substances present at the beginning of a chemical reaction.
16. of Conservation of Matter States that matter cannot be created or destroyed in a chemical reaction.
17. A horizontal row in the periodic table where elements have the same number of electron shells.