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9th Grade Chemistry
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9th Grade Chemistry
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25 Questions

1. The number of an element determined by the number of protons in it's nucleus

2. chemical bond formed between atoms where electrons are shared

3. Family 18 of the periodic table; elements have atoms with 8 valence electrons, and are extremely unreactive.

4. The arrangements of elements according to their atomic number; organized into groups and periods

5. heat is transferred by direct contact

6. The fundamental unit of matter found in the universe made of a nucleus of protons and neutrons and orbiting electrons.

7. Negatively charged particles that orbit the nucleus of atoms

8. Hund's rule state that

9. The part of the nucleus of atoms that have no electrical charge.

10. Periodic table has 7

11. State of matter with indefinite shape and definite volume

12. The electrons found in the OUTERMOST energy level of an atom

13. The positively charged part of atom found in the nucleus

14. State of matter where particles move rapidly and collide; indefinite shape and volume

15. heat is transferred through electromagnetic waves

16. the Atomic Theory

17. heat is transferred by the movement of fluids (gas, liquids); warm particles rise and cold particles sink

18. The history of atomic theory by scientist from oldest to newest

19. As we go down periods in group 1 element become more reactive

20. substance made up of more than one kind of atom (Example: H2O)

21. An atom that has become charged due to loss or gain of eletrons

22. Isotope

23. Mass number

24. the space outside the nucleus where electrons orbit

25. The atomic number of an element

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