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Exam 4: Atoms and Elements

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Question 61

Multiple Choice

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Group 1A elements are also called:

A) noble gases.
B) halogens.
C) alkaline earth metals.
D) alkali metals.
E) none of the above

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Question 62

Multiple Choice

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A specific isotope of an element is known to have 15 protons and 16 neutrons.Which symbol would properly represent this isotope?

A)
Ga
B)
P
C)
X
D)
S
E) none of the above

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Question 63

Multiple Choice

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A fictional element has two isotopes,each making up 50% of the population.Isotope 1 has a mass of 80.0 amu,Isotope 2 has a mass of 85.0 amu.Calculate the atomic mass of the fictional element.

Group 2A elements are called alkali metals.

The relative amount of each different isotope in a naturally occurring sample of an element is always the same.

A fictional element has two isotopes and an atomic mass of 87.08 amu.If the first isotope is 86 amu and the second isotope has a mass of 90 amu.Which isotope has the greatest natural abundance?

Mendeleev is best remembered for his pioneering work on determining atomic structure.

The atomic mass of a single carbon atom is equal to exactly 12.011 amu.

Aluminum is one of the most commonly used metalloids.

How many electrons are in Br^-?

Which one of the following is a main-group element?

What is the charge on the ion formed by aluminum?