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21.The periodic table of the elements does not list whole

Question : 21.The periodic table of the elements does not list whole : 1409659

 

 

21.The periodic table of the elements does not list whole numbers for atomic weights.  Why?

A. The atomic weights are not predictable.

B. The atomic weights include protons and neutrons at 1 amu each, but they also include

electrons, which weigh a lot less than one.

C. The atomic weight is the weighted average of the masses of the known isotopes of an element.

D. The atomic weights do not include isotopes.

 

22.Where are the metals located on the periodic table of the elements?

A.  On the right

B.  Along the line between B and Al to between Po and At.

C.  On the left

D.  In the two sections separated from the rest of the table.

 

23.The higher up within a group or family on the periodic table,

A.  the heavier the nucleus.

B.  the more the element is likely to conduct electricity.

C.  the more nonmetallic in character.

D.  the more the element is likely to be a semimetal.

 

24.What is the relationship of a metal atom to the right of another metal atom in the same period?

A.  The atom to the right is usually the smaller in diameter.

B.  The atom to the right is usually the smaller in atomic weight.

C.   The atom to the right is usually the smaller in atomic number.

D.  The atom to the right is more likely to have fewer isotopes.

 

25.How many atoms of sodium are there in 0.2 moles sodium atoms?

A.  6.02 x 1024 atoms

B.  6.02 x 1023 atoms

C.  1.2 x 1023 atoms

D.  12 x 1023 atoms

 

26.  How many carbon(C) atoms are present in 30 moles of carbon?

A. 12 C atoms

B. 1.8 x 1023 C atoms

C. 360 C atoms

D. 6.02 x 1023 C atoms

 

27.  The number of moles of calcium (Ca) represented by 7.39 g of calcium is

A. 40.0 moles of Ca

B. 18.6 moles of Ca

C. 0.184 mole of Ca

D. 296 moles of Ca

 

28.Iron has the atomic weight of 55.9.  What is the number of atoms in one mole of iron?

A.  55.9 atoms

B.  1 x 1024 atoms

C.  6.02 x 1023 atoms

D.  12 dozen atoms

 

29.A sample of magnesium weighs 10 grams.  How many moles of magnesium are there in the sample?

A.  10 moles

B.  6 x 1023 moles

C.  60 x 1023 atoms

D.  0.4 moles

 

30.What is the number of atoms present in a 20 gram sample of lithium?

A.  138

B.  1.2 x 1025

C.  1.7 x 1024

D.  4.0 x 1024

 

 

Solution
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