Question 1

Which scientist is credited with organizing the first widely accepted periodic table by arranging elements in order of increasing atomic mass and predicting the properties of undiscovered elements?

Accepted Answer

Dmitri Mendeleev

Question 2

According to the periodic law, the properties of elements recur in a repeating pattern when arranged by which of the following?

Accepted Answer

Increasing atomic number

Question 3

Which of the following statements best explains why atomic radius decreases from left to right across a period?

Accepted Answer

The number of protons increases, pulling electrons closer

Question 4

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 18

Question 5

A student is asked to predict the formula for the oxide of strontium (Sr), which is in the same group as calcium (Ca). Given that the formula for calcium oxide is $\mathrm{CaO}$, what is the correct formula for strontium oxide?

Accepted Answer

$\mathrm{SrO}$

Question 6

Which element would have the highest ionization energy among the following: sodium (Na), magnesium (Mg), or aluminum (Al)?

Accepted Answer

Aluminum (Al)

Question 7

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

Accepted Answer

$\mathrm{K^+}$

Question 8

What is the predicted ionic charge for an atom of sulfur (S), based on its position in Group 16 of the periodic table?

Accepted Answer

$2-$

Question 9

Which of the following elements is a member of the alkaline earth metals?

Accepted Answer

Calcium (Ca)

Question 10

If the electron configuration for sodium (Na) is $1s^2\ 2s^2\ 2p^6\ 3s^1$, what is the abbreviated electron configuration using noble gas notation?

Accepted Answer

$[Ne]\ 3s^1$

Question 11

Which block of the periodic table is being filled when electrons occupy the $4f$ sublevel?

Accepted Answer

f block

Question 12

A chemist wants to predict the melting point of francium (Fr) based on the trend in Group 1 alkali metals. If cesium (Cs) has a melting point of $28.4\ ^\circ\mathrm{C}$, what is the most reasonable prediction for Fr?

Accepted Answer

Less than $28.4\ ^\circ\mathrm{C}$

Question 13

Which element in Period 3 of the periodic table is a noble gas?

Accepted Answer

Argon (Ar)

Question 14

What is the electron dot formula for silicon (Si), which has 4 valence electrons?

Accepted Answer

Si with 4 dots

Question 15

Which of the following elements has the greatest metallic character?

Accepted Answer

Sodium (Na)

Question 16

If an atom of magnesium (Mg) loses two electrons, what is the electron configuration of the resulting ion?

Accepted Answer

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

Question 17

Which of the following elements is classified as a transition metal?

Accepted Answer

Iron (Fe)

Question 18

Which element would you expect to have the largest atomic radius: lithium (Li), sodium (Na), or potassium (K)?

Accepted Answer

Potassium (K)

Question 19

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

Accepted Answer

Ionization energy increases

The Periodic Table: Classification, Organization, and Trends

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