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Across 3. A SUBATOMIC PARTICLE THAT HAS A POSITIVE CHARGE AND THAT IS LOCATED IN THE NUCLEUS OF AN ATOM 5. THE SMALLEST UNIT OF AN ELEMENT THAT MAINTAINS THE PROPERTIES OF THAT ELEMENT 6. A REGION AROUND THE NUCLEUS OF AN ATOM WHERE ELECTRONS ARE LIKELY TO BE FOUND 7. THE NUMBER OF PROTONS IN THE NUCLEUS OF AN ATOM; THE ATOMIC NUMBER IS THE SAME FOR ALL ATOMS OF AN ELEMENT 10. THE SUM OF THE NUMBERS OF PROTONS AND NEUTRONS IN THE NUCLEUS OF AN ATOM 11. A SUBATOMIC PARTICLE THAT HAS A NEGATIVE CHARGE

Down 1. THE MASS OF AN ATOM EXPRESSED IN ATOMIC MASS UNITS 2. A UNIT OF MASS THAT DESCRIBES THE MASS OF AN ATOM OR MOLECULE 4. AN ATOM THAT HAS THE SAME NUMBER OF PROTONS (OR THE SAME ATOMIC NUMBER) AS OTHER ATOMS OF THE SAME ELEMENT DO BUT THAT HAS A DIFFERENT NUMBER OF NEUTRONS (AND THUS A DIFFERENT ATOMIC MASS) 8. IN PHYSICAL SCIENCE, AN ATOM'S CENTRAL REGION, WHICH IS MADE UP OF PROTONS AND NEUTRONS 9. A SUBATOMIC PARTICLE THAT HAS NO CHARGE AND THAT IS LOCATED IN THE NUCLEUS OF AN ATOM