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31. Sulfur has __________ electrons and ____ valence electrons. A. 16,

Question : 31. Sulfur has __________ electrons and ____ valence electrons. A. 16, : 1409660

 

 

 

31. Sulfur has __________ electrons and ____ valence electrons.

A. 16, 6

B. 32, 4

C. 16, 0

D. 32, 6

 

32. The maximum number of electrons that a particular energy level n can hold is

A. n2

B. 2n

C. 2n2

D. n-1

 

33.  Which form of ionizing radiation is most penetrating?

A.  alpha

B.  beta

C.  gamma

D.  positron

 

34.When a radioactive isotope emits a _____, its atomic number increases.

A.  alpha particle

B.  beta particle

C.  gamma ray

D.  positron

 

35.If radium, , were to emit an alpha particle, what would be the other product?

A.  beta particles

B.

C.

D.

 

36.Scandium-40 enters into a reaction in which a positron is emitted.  Which is the correct equation for this reaction?

A.

B.

C.

D.

 

37.Which equation below correctly depicts nitrogen-13 emitting a positron?

A.

B.

C.

D.

 

38.  Radioisotopes with short half-lives are used in diagnostic tests because

A. they have high energy.

B. they are inexpensive.

C. they do not pose health risks by being present long after use.

D. they have less penetration ability.

 

39.Most elements have radioisotopes.  What is a radioisotope?

A.  An isotope that has a different atomic number.

B.  An isotope that releases nuclear radiation.

C.  An isotope that releases electrical radiation.

D.  Any isotope that can absorb nuclear particles.

 

 

40.What is the minimum protection against exposure to beta particles?

A.  None, beta particles are of low energy and cannot penetrate skin.

B.  Gloves, a lab coat, or over a meter’s distance from the source.

C.  A thin sheet of plastic or metal.

D.  A sheet of lead.

 

 

Solution
5 (1 Ratings )

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Chemistry 1 Year Ago 32 Views
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