Question 1

Which of the following statements best explains why noble gases are generally nonreactive?

Accepted Answer

They have a full valence shell, resulting in a stable electron configuration.

Question 2

What is the electron configuration for selenium (Se), atomic number 34, using noble gas notation?

Accepted Answer

$$[Ar] 4s^2$ 3d$$^{10}$$ 4p^4$

Question 3

A main-group element has an outer electron configuration of $$ns^2. $$What charge is it most likely to have when forming an ion?

Accepted Answer

$$2+$$

Question 4

Which of the following elements is most likely to form a $$1-$$ anion?

Accepted Answer

Chlorine

Question 5

Which block of the periodic table contains elements whose valence electrons fill the $$d$$ sublevel?

Accepted Answer

d-block

Question 6

What is the total number of valence electrons in germanium (Ge)?

Accepted Answer

4

Question 7

Which of the following best describes the trend in atomic radius as you move down a group in the periodic table?

Accepted Answer

Atomic radius increases because the valence shell is farther from the nucleus.

Question 8

Which element has the electron configuration $$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^1$$?

Accepted Answer

Aluminum

Question 9

Transition metals often have irregular electron configurations. Which of the following is the correct electron configuration for copper (Cu)?

Accepted Answer

$$[Ar] 4s^1$ 3d$$^{10}$$

Question 10

Which of the following statements about effective nuclear charge ($$Z_{eff}) is $$correct?

Accepted Answer

$$Z_{eff}$$ increases across a period due to poor shielding by valence electrons.

Question 11

Which of the following elements is most likely to lose two electrons to form a $$2+$$ cation in a chemical reaction?

Accepted Answer

Calcium

Question 12

Which of the following is the correct electron configuration for phosphorus (P)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^3$$

Question 13

A main-group element has the electron configuration $$[Ne] 3s^2$ 3p^4$. What is the most likely charge of its ion?

Accepted Answer

$$2-$$

Question 14

Which of the following best describes the behavior of metalloids in chemical reactions?

Accepted Answer

They can either lose electrons to form cations or gain electrons to form anions.

Question 15

Which of the following elements is located in the p-block of the periodic table?

Accepted Answer

Oxygen

Question 16

Which of the following is a correct step when writing the electron configuration for an element using the periodic table?

Accepted Answer

Locate the noble gas that precedes the element and use its symbol in brackets.

Question 17

Which of the following elements is most likely to have a higher effective nuclear charge ($$Z_{eff}) $$than its neighbor in the same period?

Accepted Answer

Fluorine compared to oxygen

Question 18

Which of the following elements is most likely to form a $$3+$$ cation?

Accepted Answer

Aluminum

Question 19

Which of the following best explains why atomic radius decreases across a period?

Accepted Answer

Increasing effective nuclear charge pulls the valence electrons closer to the nucleus.

Question 20

Which of the following elements is most likely to gain electrons in the p orbitals to achieve a noble gas configuration?

Accepted Answer

Sulfur

lecture 11

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