Atomic Structure

2. A periodic group, or ____________________ is a vertical column of elements that share characteristics
6. An element that has an unstable nucleus is ___________________
9. Carbon, Gold, Copper, Hydrogen, everything on the periodic table is an ______________________
10. A __________________ change cannot be easily reversed.
11. An unstable element will lose particles to become stable. this is called _____________
12. Ice melting into liquid water is an example of a __________________ change
15. An electron has a ____________________ charge
16. A proton's charge is ________________
17. the atomic __________________ is the number of protons in the nucleus
18. Carbon 12 has six protons and six neutrons. Carbon 14 has _______________ neutrons

1. The two letter shortening of an elements name is referred to as its atomic ______________
3. Two elements with the same number of protons and different numbers of neutrons
4. A neutron has _____ charge
5. the electrons in an atom's outermost shell
7. the number that indicates the number of protons PLUS neutrons in the nucleus
8. these very small, negatively charged particles orbit the nucleus
12. Different elements have different numbers of these particles
13. This guy is definitely NOT dead! (and he loves science)
14. these gases have completely filled outer shells