Question 1

Which of the following statements best describes the atomic theory as presented in Chapter 2?

Accepted Answer

Atoms of a given element differ from the atoms of all other elements.

Question 2

Given the isotope symbol $$\ ^{12}_{6}\mathrm{C} $$ shown in the image, how many neutrons does this atom contain?

Accepted Answer

6

Question 3

Which subatomic particle has a mass approximately $$1/1836$$ that of a proton and carries a negative charge?

Accepted Answer

Electron

Question 4

What is the electron configuration for magnesium (Mg), atomic number 12?

Accepted Answer

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

Question 5

Which group of the periodic table contains elements that are colorless gases and are generally unreactive?

Accepted Answer

Group 8A (Noble gases)

Question 6

How many electrons can the third shell of an atom hold?

Accepted Answer

18

Question 7

Which of the following best describes the shape of p orbitals?

Accepted Answer

Dumbbell-shaped

Question 8

A neutral atom of phosphorus (atomic number 15) has how many protons, electrons, and neutrons if its mass number is 31?

Accepted Answer

15 protons, 15 electrons, 16 neutrons

Question 9

Which of the following is the correct shorthand electron configuration for sodium (Na)?

Accepted Answer

$$[Ne]\ 3s^1$

Question 10

What is the general valence-shell configuration for elements in group 6A?

Accepted Answer

$$ns^2$$\ $$np^4$$

Question 11

Which element is represented by the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^2$$?

Accepted Answer

Silicon (Si)

Question 12

Which of the following elements is a metalloid?

Accepted Answer

Boron (B)

Question 13

If an atom has 28 protons and 32 neutrons, what is its mass number and which element is it?

Accepted Answer

Mass number 60, Nickel (Ni)

Question 14

Which block of the periodic table contains elements whose last electron enters an f orbital?

Accepted Answer

f block

Question 15

What is the electron-dot symbol for an element in group 5A?

Accepted Answer

Five dots arranged around the atomic symbol

Question 16

Which of the following elements has the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^2$$?

Accepted Answer

Calcium (Ca)

Question 17

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have identical atomic numbers but different mass numbers.

Question 18

Which element has four valence electrons in the 5th shell and what is its valence-shell configuration?

Accepted Answer

Tin (Sn), $$5s^2$$\ $$5p^2$$

Question 19

Which rule states that two or more orbitals with the same energy are each half-filled by one electron before any one orbital is completely filled?

Accepted Answer

Hund's rule

Atoms and the Periodic Table: Structure, Properties, and Electron Configurations

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