Question 1

Which statement best explains why a red shirt appears red to our eyes?

Accepted Answer

The shirt absorbs all colors except red, which it reflects.

Question 2

Which form of electromagnetic radiation has the shortest wavelength?

Accepted Answer

Gamma rays

Question 3

According to the Pauli exclusion principle, how many electrons can occupy the same orbital?

Accepted Answer

$$2$$

Question 4

Which of the following statements about the principal quantum number $$n is $$TRUE?

Accepted Answer

It specifies the energy level of the electron.

Question 5

What is the electron configuration for potassium ($$K$$)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^6$$ $$4s^1$$

Question 6

Which element would you use in the noble gas shorthand notation for the electron configuration of bromine ($$Br$$)?

Accepted Answer

Ar

Question 7

How many valence electrons are in a chlorine atom?

Accepted Answer

$$7$$

Question 8

Which of the following elements has the lowest ionization energy?

Accepted Answer

K

Question 9

The size of an atom generally increases:

Accepted Answer

Down a group and from right to left across a period.

Question 10

Which atom is the largest among the following?

Accepted Answer

K

Question 11

Which of the following atoms has the least metallic character?

Accepted Answer

Cl

Question 12

How many core electrons are in a ground state atom of arsenic ($$As$$)?

Accepted Answer

$$28$$

Question 13

Which of the following species has the electron configuration $$1s^2$$ $$2s^2$$ $$2p^6$$?

Accepted Answer

Na$$^+$$

Question 14

When filling orbitals of equal energy, electrons fill them singly first with parallel spins. This is known as:

Accepted Answer

Hund's rule

Question 15

The sublevel that has three orbitals and can hold up to six electrons is the:

Accepted Answer

p sublevel

Question 16

Which among the following statements is TRUE?

Accepted Answer

As the energy increases, the frequency of radiation increases.

Question 17

Visible light makes up the largest portion of the electromagnetic spectrum.

Accepted Answer

FALSE

Question 18

The most energetic photons are:

Accepted Answer

Gamma rays

Question 19

A bright red shirt with a value of $$n=2$$ would contain:

Accepted Answer

s and p orbitals

Question 20

The orbital diagram for fluorine shows 1 unpaired electron in a $$2p$$ orbital. What is the electron configuration for fluorine?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^5$$

Electrons in Atoms and the Periodic Table: Study Notes for Chapter 9

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