Question 1

Which scientist is credited with arranging the periodic table by increasing atomic number, leading to the modern periodic law?

Accepted Answer

Henry Moseley

Question 2

Why did Mendeleev leave gaps in his periodic table and predict the existence of elements such as germanium (Ge)?

Accepted Answer

He believed undiscovered elements would fill those gaps based on periodic trends.

Question 3

The modern periodic law is based on which of the following properties?

Accepted Answer

Increasing atomic number

Question 4

Which of the following elements is a fourth period representative element with the lowest atomic number?

Accepted Answer

K

Question 5

Which of the following is the correct trend for atomic radius across a period from left to right?

Accepted Answer

Atomic radius decreases

Question 6

Calculate the density of barium, given the density of calcium is $$1.54\ \mathrm{g/cm^3$}$$ and calcium and barium are in the same group. If barium is twice as heavy as calcium but has the same volume, what is its density?

Accepted Answer

$$3.08\ \mathrm{g/cm^3$}$$

Question 7

Which element would have chemical properties most similar to sulfur (S)?

Accepted Answer

Oxygen (O)

Question 8

Which subshell is being filled by the elements Ga through Kr?

Accepted Answer

$$4p$$

Question 9

What is the electron configuration for an atom of tin (Sn)?

Accepted Answer

$$[Kr]\ 5s^2$\ 4d$$^{10}$$\ 5p^2$

Question 10

Predict the number of valence electrons for a Group IIA (2) element.

Accepted Answer

2

Question 11

Which of the following groups of elements has the highest ionization energy?

Accepted Answer

Group VIIIA (18)

Question 12

Which of the following is a general trend for the ionization energy of elements in the periodic table?

Accepted Answer

Increases from left to right; decreases from top to bottom

Question 13

Which of the following groups has a predictable ionic charge of two negative?

Accepted Answer

Group VIA (16)

Question 14

What is the electron configuration for a fluoride ion, $$F^-$$?

Accepted Answer

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

Question 15

Which of the following elements has the most nonmetallic character?

Accepted Answer

F

Question 16

Which of the following ions is not isoelectronic with argon?

Accepted Answer

$$Mg^{2+}$$

Question 17

What is the core electron configuration for a gallium ion, $$Ga^{3+}$$?

Accepted Answer

$$[Ar]$$

Question 18

Which of the following elements has the largest atomic radius?

Accepted Answer

K

Question 19

Which energy subshell is being filled by the elements Y through Cd?

Accepted Answer

$$4d$$

Question 20

Which of the following is the correct electron configuration for a titanium(IV) ion, $$Ti^{4+}$$?

Accepted Answer

$$[Ar]$$

Introductory Chemistry: The Periodic Table – Study Guidance

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