Question 1

How many orbitals are there, in total, in the first three quantum shells of an atom?

  A  

3

  B  

6

  C  

9

  D  

14

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Question 2

This question refers to isolated gaseous atoms.

In which atom are all electrons paired?

  A  

Ba

  B  

Br

  C  

S

  D  

Si

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Question 3

The electronic configuration of the two outermost shells of an atom is 3s23p63d54s2.

What is this atom?

  A  

manganese

  B  

phosphorus

  C  

strontium

  D  

vanadium

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Question 4

Which statement about an atom of 23Na is correct?

  A  

it is an isomer of sodium

  B  

it has an atomic number of 23

  C  

it has 12 neutrons in its nucleus

  D  

it has a mass number of 11

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Question 5

Which statement about p-orbitals is correct?

  A  

a p-orbital is spherical in shape

  B  

a p-orbital can contain two electrons

  C  

there are six p-orbitals in a p-subshell

  D  

an element with outer configuration of p2 has both electrons in the same p-orbital

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Question 6

What is a possible mass number of a magnesium isotope?


  A  

12

  B  

23.99


  C  

24

  D  

24.3

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Question 7

An element forms ions with a charge of 3+.

What could be the electron configuration of the atoms of the element?

  A  

1s2 2s2 2p3

  B  

1s2 2s2 2p6 3s2 3p6 3d1 4s2

  C  

1s2 2s2 2p6 3p1

  D  

1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p3

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Question 8

What is the shape of an s-orbital?

  A  

circle

  B  

dumbbell

  C  

oval

  D  

sphere

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Question 9

Which element has atoms with the greatest number of singly occupied orbitals?

  A  

C

  B  

Cl

  C  

Ca

  D  

Ga

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Question 10

Which ion has a different number of electrons from the other three ions?

  A  

Ga3+

  B  

Cl-

  C  

S2-

  D  

Ca2+

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Question 11

A sample of boron contains the isotopes 10B and 11B.

The relative atomic mass of the boron sample is 10.8.

What is the percentage of 11B atoms in the sample of boron?

  A  

8.0%

  B  

20%

  C  

80%

  D  

92%

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Question 12

What is the electron configuration of V2+ in the ground state?

  A  

1s2 2s2 2p6 3s2 3p6 3d3

  B  

1s2 2s2 2p6 3s2 3p6 3d1 4s2

  C  

1s2 2s2 2p6 3s2 3p6 3d3 4s2

  D  

1s2 2s2 2p6 3s2 3p6 3d5 4s2

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Question 13

Which atom has the smallest number of neutrons?

  A  

3H

  B  

4He

  C  

5He

  D  

4Li

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Question 14

Which is the electron configuration of an atom with only two unpaired electrons?

  A  

1s2 2s2 2p3

  B  

1s2 2s2 2p4

  C  

1s2 2s2 2p6 3s2 3p5

  D  

1s2 2s2 2p6 3s2 3p6 4s1 3d5

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