Atomic Numbers and Electron Configurations

Question 1

The electron configuration for magnesium is shown below.1s22s22p63s2Which diagram shows the correct distribution of electrons in the electron shells of a magnesium atom?

Revolt · Accepted Answer

A gray circle labeled 12 P 12 N is surrounded by three concentric circles. The innermost circle has gray dots at the north and south positions; the middle circle has eight gray dots equally spaced around the circle, with dots aligned with those in the inner circle; the outer circle has gray dots at the north and south positions.

Question 2

Which is the electron configuration for lithium?

Revolt · Accepted Answer

1s22s1

Question 3

Each atom of an element has the following electron configuration.1s22s22p63s23p64s23d104p65s24d105p5What is the name of the element?

Revolt · Accepted Answer

iodine

Question 4

If a shell can hold a maximum of 32 electrons, what is the value of n?

Revolt · Accepted Answer

4

Question 5

Which diagram shows a pair of electrons that have opposite spins?

Revolt · Accepted Answer

A box contains an upward pointing and a downward pointing arrow.

Question 6

Consider the model of a sodium atom.Which feature does the model show accurately?

Revolt · Accepted Answer

the distribution of electrons in different shells

Question 7

Consider the model of the nitrogen atom.Which electron configuration matches this model?

Revolt · Accepted Answer

1s22s22p3

Question 8

To show the electron configuration for an atom, what is the advantage of using an orbital notation compared to a dot structure?

Revolt · Accepted Answer

Orbital notation shows the spin of the electrons.

Question 9

Which set of numbers gives the correct possible values of l for n = 3?

Revolt · Accepted Answer

0, 1, 2

Question 10

Which is the electron configuration for boron?

Revolt · Accepted Answer

1s22s22p1

Atomic Numbers and Electron Configurations Answers

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