Question 1

Which of the following best explains why Mendeleev was able to predict the properties of undiscovered elements such as germanium?

Accepted Answer

He arranged elements by increasing atomic mass and noticed regular intervals in their properties.

Question 2

Which statement about the periodic law is correct?

Accepted Answer

The properties of elements recur in a repeating pattern when arranged by increasing atomic number.

Question 3

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 18

Question 4

Which of the following elements is classified as a representative (main-group) element?

Accepted Answer

Ca

Question 5

What is the general trend for atomic radius as you move from left to right across a period?

Accepted Answer

Atomic radius decreases due to increased nuclear charge pulling electrons closer.

Question 6

Which element would you expect to have the highest ionization energy?

Accepted Answer

Kr

Question 7

A student is asked to predict the formula for the chloride of barium. Given that calcium forms $\mathrm{CaCl_2}$, what is the correct formula for barium chloride?

Accepted Answer

$\mathrm{BaCl_2}$

Question 8

Which of the following best describes the trend in metallic character on the periodic table?

Accepted Answer

Metallic character increases from top to bottom in a group and decreases from left to right across a period.

Question 9

Which of the following ions is isoelectronic with argon ($\mathrm{Ar}$)?

Accepted Answer

$\mathrm{Cl^-}$

Question 10

Which of the following elements is most likely to form a $2+$ ion?

Accepted Answer

Calcium ($\mathrm{Ca}$)

Question 11

What is the electron configuration for a neutral sodium atom ($\mathrm{Na}$)?

Accepted Answer

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

Question 12

Which of the following statements about elements in the same group (family) is NOT true?

Accepted Answer

They are all in the same period.

Question 13

Which of the following best explains why the alkali metals are highly reactive?

Accepted Answer

They have one valence electron that is easily lost to achieve a noble gas configuration.

Question 14

Which of the following is the correct electron dot structure for phosphorus ($\mathrm{P}$), which is in Group 15?

Accepted Answer

P with 5 dots

Question 15

Which energy sublevel is being filled in the elements from gallium ($\mathrm{Ga}$) to krypton ($\mathrm{Kr}$)?

Accepted Answer

$4p$

Question 16

A sulfide ion ($\mathrm{S^{2-}}$) has how many valence electrons?

Accepted Answer

8

Question 17

Which of the following best describes the trend in ionization energy across a period from left to right?

Accepted Answer

Ionization energy increases due to increased nuclear charge.

Question 18

Which of the following elements is an inner transition element?

Accepted Answer

Neodymium ($\mathrm{Nd}$)

Question 19

Which of the following best explains why hydrogen is placed in a unique position on the periodic table?

Accepted Answer

It is a gas with properties similar to nonmetals but also reacts by losing one electron like metals.

Question 20

Which of the following ions has the same electron configuration as a neutral neon atom ($\mathrm{Ne}$)?

Accepted Answer

$\mathrm{F^-}$

Chapter 5: The Periodic Table – Structure, Trends, and Properties

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