Just need to make sure answers are correct

Question 1 

Arrange the steps in formation of the elements in the correct order:

I. formation of oxygen-16

II. helium burning

III. hydrogen burning

IV. reaction of beryllium-8 with helium-4

V. successive fusions up to calcium-40









Answer is C

Question 2

Which element was probably not formed when a neutron star exploded as a
supernova?





Answer is E

Question 3

Which element was probably formed when a neutron star exploded as a
supernova?





Answer is C

Question 4 

The r process of formation of heavy elements takes place when a nucleus





Answer is E

Question 5

The s process of formation of heavy elements takes place when a nucleus





Answer is C

Question 6 

Which group of elements is normally obtained from the atmosphere in pure
form?



Answer is E



Question 7

The most abundant metal in the earth's crust is



Answer is C

Question 8

A naturally occurring inorganic compound with a characteristic
composition and crystal structure is called __________.





Answer is C

Question 9 

All of the following are among the most common types of minerals except





Question 10 

All of the following are examples of condensed silicates except





Answer is D

Question 11 

The most economically important transition metal is





Answer is C

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Question 12 

The metal with the highest melting point is _____, and the one with the
lowest melting point is _____.





Answer is E

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Question 13

Which group of elements could be correctly classified as not being
transition metals?





Answer is D

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Question 14

Which group of elements is chemically similar to the Group 2 (IIA)
elements?





Answer is A

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Question 15

Which pair of elements will always display the oxidation states of +2
and +3 respectively?





Answer is A

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Question 16

The explanation for the [Ar]3d54s1 electron configuration of chromium is
that





Answer is A

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Question 17

The electron configuration of Co is [Ar]3d74s2. The electron
configuration of the Co2+ ion is most likely to be





Answer is B

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Question 18

The correct electron configuration for silver is





Answer is D

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Question 19

The correct electron configuration for silver ion is





Anwer is E

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Question 20

The element Mo follows the same pattern of filling orbitals as other
elements in its group. Its electron configuration is





Answer is B