Question

part i. matching: match the choices to the statements. use each choice once.

1. the number of protons in an atom
2. elements that are made in the lab
3. elements that give off particles
4. he drew the first periodic table.
5. a positively charged particle in an atom
6. tiny structures found in all matter
7. the vertical columns in the periodic table
8. the horizontal rows in the periodic table
9. only bromine and mercury are this state of matter at room temperature.
10. these substances are made of one kind of atom.
11. two or more elements or compounds physically together
12. hydrogen, helium, and chlorine are in this state of matter.
13. this shows all the elements organized by their properties.
14. two or more atoms that are chemically bonded
15. elements that have characteristics of both metals and nonmetals
16. most of the elements are in this state of matter at room temperature.
17. every element has one of these. it usually has two letters, but some have one or three letters.
18. these conduct heat and electricity. they have a shiny luster. they can be pounded into shapes or drawn into wires.
19. they tried to combine science and magic. they tried to change lead into gold. they discovered the scientific method.
20. these are poor conductors of heat and electricity. they have a dull luster. when pounded, they form powders or get shattered.

a. alchemists
b. atomic number
c. atoms
d. compound
e. elements
f. element family
g. gas
h. liquid
i. mendeleyev
j. metals
k. metalloid
l. mixture
m. nonmetals
n. period
o. periodic table
p. proton
q. radioactive
r. solid
s. symbol
t. synthetic

Explanation:

1. The number of protons in an atom is defined as the atomic number.
2. Elements made in the lab are synthetic.
3. Elements that give off particles are radioactive.
4. Mendeleyev drew the first periodic table.
5. A positively - charged particle in an atom is a proton.
6. Atoms are tiny structures found in all matter.
7. The vertical columns in the periodic table are element families.
8. The horizontal rows in the periodic table are periods.
9. Bromine and mercury are liquids at room temperature.
10. Substances made of one kind of atom are elements.
11. Two or more elements or compounds physically together form a mixture.
12. Hydrogen, helium, and chlorine are gases at room temperature.
13. The periodic table shows all elements organized by their properties.
14. Two or more atoms chemically bonded form a compound.
15. Elements with characteristics of both metals and non - metals are metalloids.
16. Most elements are solids at room temperature.
17. Each element has a symbol.
18. Metals conduct heat and electricity, have a shiny luster, and can be shaped or drawn into wires.
19. Alchemists tried to combine science and magic and change lead into gold, and discovered the scientific method.
20. Nonmetals are poor conductors of heat and electricity, have a dull luster, and shatter or form powders when pounded.

Answer:

1. B. Atomic Number
2. T. Synthetic
3. Q. Radioactive
4. I. Mendeleyev
5. P. Proton
6. C. Atoms
7. F. Element Family
8. N. Period
9. H. Liquid
10. E. Elements
11. L. Mixture
12. G. Gas
13. O. Periodic Table
14. D. Compound
15. K. Metalloid
16. R. Solid
17. S. Symbol
18. J. Metals
19. A. Alchemists
20. M. Nonmetals