Question 1

Which of the following correctly describes the trend in atomic size as you move from left to right across a period in the periodic table?

Accepted Answer

Atomic size decreases because the effective nuclear charge increases, pulling electrons closer.

Question 2

Which of the following ions is isoelectronic with neon ($$Ne$$)?

Accepted Answer

$$F^-$$

Question 3

Barium chloride ($$BaCl_2) is $$formed when barium reacts with chlorine. What type of bond is formed between barium and chlorine in this compound?

Accepted Answer

Ionic bond

Question 4

Which of the following best explains why $$Ba^{2+}$$ forms when barium reacts with chlorine?

Accepted Answer

Barium loses two electrons to achieve a noble gas configuration.

Question 5

Which of the following correctly represents the balanced chemical equation for the formation of barium chloride from its elements?

Accepted Answer

$$Ba + Cl_2$ \rightarrow $$BaCl_2$$

Question 6

Which of the following statements about ionization energy is correct?

Accepted Answer

Ionization energy increases as you move from left to right across a period.

Question 7

A student is asked to predict which element, sodium ($$Na) or $$potassium ($$K$$), has a larger atomic radius. Which is correct and why?

Accepted Answer

Potassium, because it has more electron shells.

Question 8

Which of the following best describes what happens to the size of an atom when it loses an electron to form a cation?

Accepted Answer

The atom becomes smaller because it loses an electron shell.

Question 9

Which of the following is the correct electron configuration for the $$Ba^{2+}$$ ion?

Accepted Answer

$$[Xe]$$

Question 10

A patient is given a solution containing $$BaCl_2. $$Which of the following statements about the ions present in the solution is correct?

Accepted Answer

The solution contains $$Ba^{2+}$$ and $$Cl^-$$ ions, with two $$Cl^-$$ ions for every $$Ba^{2+}$$ ion.

Question 11

Which of the following best explains why chlorine forms a $$Cl^-$$ ion?

Accepted Answer

Chlorine gains one electron to achieve a noble gas configuration.

Question 12

Which of the following is the correct formula for the compound formed between barium and chlorine?

Accepted Answer

$$BaCl_2$$

Question 13

If the atomic number of barium is 56, what is the number of electrons in a $$Ba^{2+}$$ ion?

Accepted Answer

54

Question 14

Which of the following best describes the process of ionic bond formation between barium and chlorine?

Accepted Answer

Barium donates two electrons to two chlorine atoms, each chlorine atom gaining one electron.

Question 15

Which of the following statements about the periodic trend in atomic size is correct?

Accepted Answer

Atomic size increases from top to bottom within a group.

Question 16

A sample of barium chloride is dissolved in water. Which of the following best describes the resulting solution?

Accepted Answer

A solution containing $$Ba^{2+}$$ and $$Cl^-$$ ions dispersed in water.

Question 17

Which of the following best explains why $$BaCl_2 is $$used in medical imaging as a contrast agent?

Accepted Answer

Because barium ions are opaque to X-rays, allowing visualization of internal structures.

Atomic Structure, Periodic Trends, and Ionic Compounds

Study Guide - Practice Questions