8th Grade Chemistry Midterm Review
1.Which is a property shared by most molecular compounds?
2. When an atom loses an electron, it becomes a
3. Magnesium bromide is an ionic compound with the chemical formula MgBr2. What does the “2” tell
you?
4. In the chemical formula for an ionic compound, which item is written first?
5. The chemical name for the compound with the formula Na2S is
6. What is a double bond?
7. Electrons involved in bonding between atoms are
8. A mixture made of two or more elements, at least one of which is a metal is called a(n)
9. What term means that metals can be rolled into thin sheets, as in aluminum foil, or beaten into complex
shapes?
10. Which groups contain the most reactive elements?
11. What are properties of ionic compounds?
12An ionic bond is the attraction between
13. Ions that are made of more than one atom are examples of
14. A chemical bond formed when two atoms share electrons is called a(n)
15. Which of the following best describes a metal crystal?
16. Ionic compounds are electrically
17. In Ernest Rutherford’s gold foil experiment, most positively charged particles passed through the foil,
but a few particles were deflected strongly. This result caused Rutherford to infer
18. Mendeleev created the first periodic table by arranging elements in order of
19. The atomic number of an element is based on the
20. From an element’s location in the periodic table, you can predict
21. In general, which of the following statements about metals is true?
22. The two most common alkaline earth metals are
23. At room temperature, more than half of the nonmetal elements are
24. The elements that do not ordinarily form compounds are
25. Beta radiation consists of particles that are identical to
26. Measurements of half-life make radioactive isotopes useful for
27. What statements about a column of the periodic table are true?
28. In the periodic table, the most reactive metals are found
29. Which group contains the most elements?
30. A material is said to be ductile if it
31. In an atom, the number of protons equals the number of
32. The elements in a row of the periodic table
33. What information in the periodic table indicates the number of protons in an atom?
34. What information in the periodic table indicates the number of protons in an atom?
35. Which group of elements have some properties of metals and some properties of nonmetals?
36. Which particles in atoms have a negative charge?
37. The atomic nuclei of unstable isotopes release fast-moving particles and energy in a process called
38. The half-life of a radioactive isotope is the length of time needed for half the atoms of a sample to
39. Radioactive isotopes called ____ can be used to detect some medical problems.
40. A piece of paper will provide protection from what kind of radiation?