PUZZLE 6

5. neutral particles that are found in the nucleus of an atom and contribute to its atomic mass (8 letters)
7. the branch of chemistry that deals with the quantitative relationships between reactants and products in chemical reactions (12 letters)
8. substances that are made up of atoms of different elements bonded together and have distinct chemical properties (9 letters)
9. the smallest units of matter that retain the properties of an element and are made up of a nucleus and electrons (5 letters)
10. the basic substances that make up all matter, which are organized on the periodic table in chemistry (8 letters)

1. the central part of an atom that is composed of protons and neutrons (7 letters)
2. the processes by which substances are transformed into new substances through the rearrangement of atoms (9 letters)
3. the smallest units of a substance that retain its chemical properties, which are made up of atoms bonded together (9 letters)
4. positive particles that are found in the nucleus of an atom and determine its atomic number (7 letters)
6. negative particles that are found outside the nucleus of an atom and are responsible for chemical reactions (8 letters)