Question: Which is the electronic configuration for oxygen?

1s2 2s2 2p1

1s2 2s2 2p3

1s2 2s2 2p4

1s2 2s2 2p6

Answer: 1s2 2s2 2p4

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Question: In which block of the periodic table is uranium (U) found?

s block

d block

p block

f block

Answer: f block

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Question: Which is the noble gas notation for chlorine?

[Ne] 4s2 4p5

[Ne] 3s2 3p5

[Ne] 3s2 3p3

[Ne] 3p2 3p5

Answer: [Ne] 3s2 3p5

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Question: It is easier to determine the electron configurations for the p-block elements in periods 1, 2, and 3 than to determine the electron configurations for the rest of the p-block elements in the periodic table because

they have a larger number of core electrons.

their electrons are assigned to s and p orbitals only.

their electrons are placed in a higher number of orbitals.

they have more valence electrons available for bonding.

Answer: their electrons are assigned to s and p orbitals only.

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Question: What is the number of valence electrons in cadmium (Cd)?

1

2

10

12

Answer: 2

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Question: Which of these elements has an electron configuration of [Kr]5s2?

barium

calcium

rubidium

strontium

Answer: strontium

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Question: Which is the noble-gas notation for lead (Pb)?

[Rn]6s24f145d106p2

[Rn]6s25d106p2

[Xe]6s24f145d106p2

[Xe]6s25d106p2

Answer: [Xe]6s24f145d106p2

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Question: In which block of the periodic table is chromium (Cr) found?

s block

d block

p block

f block

Answer: d block

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Question: Which is the electron configuration for nobelium (No)?

[Rn]7s25f14

[Rn]7s25f7

[Ne]3s23p7

[Xe]6s25d1

Answer: [Rn]7s25f14

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Question: Arsenic does not have any valence electrons in the 3d orbital because

its 3d orbital is completely filled.

it only contains enough electrons to fill the 2s orbital.

it is an inert substance that is not reactive.

all of its valence electrons are in the 3p orbital.

Answer: its 3d orbital is completely filled.

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Question: How many valence electrons does lithium (Li) have available for bonding?

1

2

3

4

Answer: 1

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Question: Which of the following elements has the fewest valence electrons?

beryllium

boron

carbon

lithium

Answer: lithium

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Question: The noble-gas notation for tin (Sn) will contain the symbol

[Ar].

[Kr].

[Xe].

[Rn].

Answer: [Kr]

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Question: The electron configuration of nitrogen (N) is

1s22s22p3

1s22s22p4

1s22s22p5

1s22s22p6

Answer: 1s22s22p3

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Question: Hydrogen reacts with an element to form a compound. Which element would have the most electrons available to react with hydrogen?

oxygen

chlorine

neon

nitrogen

Answer: chlorine

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