Chemistry Semester 1 Vocab

3. Unstable isotopes that spontaneously are called ___________.
7. 6.022x10^23 copies an atom or molecule.
9. Elements like carbon, nitrogen, and oxygen on the right hand side of the periodic table.
11. The unequal distribution of charge in a polar molecule is called a ________, meaning "two poles".
13. A positively charged subatomic particle.
15. A column in the periodic table.
17. One copy of a covalent compound.
19. A 3 dimensional region around the nucleus where an electron is likely to be found.
20. The strength of attraction between an atom and a pair of bonding electrons.
22. The range of wavelengths that light can have.
24. When two nuclei combine to make a larger nucleus.
25. A neutrally charged subatomic particle.
26. The smallest unit of matter that maintains an element's chemical properties.
27. Most of the elements of the periodic table fit into this category.
28. The highest energy state of matter.
30. The type of radiation that carries enough energy to break chemical bonds and damage DNA.

1. The amount of time it takes for 50% of a radioactive substance to decay.
2. The attraction to a sea of shared electrons that are free to move between atoms is called a _______ bond.
4. A row in the periodic table
5. A chemical bond in which no electrons are shared.
6. The type of force that attracts electrons to the nucleus.
8. A negatively charged subatomic particle.
10. Where more than 99% of an atom's mass is located.
12. Forces between molecules are called _________ forces.
14. The sharing of a pair of electrons between two atoms.
16. When a nucleus splits into 2 or more smaller nuclei.
18. A list of the atoms in a compound.
21. One copy of an ionic compound.
23. In a ________ covalent bond, electrons are shared unequally.
28. A particle of light.
29. Two electrons that share the same orbital must have opposite _______.