Atomic Structure Practice Problems

Elements under the same group in the periodic table exhibit the same chemical properties and reactivity. Explain why.

What is the electronic configuration of chlorine (Cl)?

Give the complete ground state electronic configuration for the two elements having atomic numbers 8 and 16.

What rule is not followed by the one who drew the following incorrect electron configuration of nitrogen (N).

How many protons and electrons do the following species have?

a. K⁺

b. Ne

c. O^2–

Which would you expect to be more reactive, the 3p or 4p orbital electrons?

Correct the mistake in the diagram for the following erroneous electron configuration of nitrogen (N).

Nitrogen has two relatively stable isotopes: ¹⁴N and ¹⁵N. Determine the number of protons and neutrons in each isotope. (Recall: nitrogen has an atomic number of 7.)

Which of the following sets of elements matches with the following set of electronic configurations [1s² 2s¹], [1s² 2s² 2p⁵], [1s² 2s² 2p⁶] and [1s² 2s² 2p⁶ 3s²]?

An unknown element has two stable isotopes, ⁵⁰X, and ⁵¹X. The relative abundance of these isotopes is 0.25%, and 99.75% respectively. ⁵⁰X has an atomic mass of 49.947 while ⁵¹X has an atomic mass of 50.943. Determine the atomic mass and identity of X.

Write the complete ground state electronic configuration of N^3-.

Write the complete ground state electronic configuration of Aluminum (Al).

There are three stable isotopes of oxygen having mass ­numbers 16, 17 and 18. Determine the number of neutrons and protons in each of these.

Select the smaller atom between S and Cl.

What is the most likely charge to result from the ionization of Sr?

What is the electron configuration of phosphorus (P)?

Determine the number of electrons rubidium must lose to obtain a noble gas configuration and identify the noble gas that corresponds to the configuration.

How many electrons must bromine lose or gain to obtain a noble gas configuration? Give the identity of the noble gas that corresponds to the configuration.

Ne is considered to be extremely stable and it is called a noble gas. Explain the stability of this element.