Question 1

The Hindenburg disaster was caused by the ignition of hydrogen gas. Which property of hydrogen makes it particularly dangerous for use in airships compared to helium?

Accepted Answer

Hydrogen is a flammable and highly reactive gas.

Question 2

Modern blimps, such as the Goodyear Blimp, are filled with helium. What is the electronic configuration of helium that makes it inert?

Accepted Answer

$$1s^2$$

Question 3

Which model of the atom first explained the emission spectrum of hydrogen but failed for multi-electron atoms?

Accepted Answer

Bohr model

Question 4

According to the quantum-mechanical model, what does an orbital represent?

Accepted Answer

A probability map showing where an electron is likely to be found

Question 5

Which scientist proposed that light consists of quantized particles called photons?

Accepted Answer

Albert Einstein

Question 6

A red shirt appears red because it reflects red light. What happens to the other colors of light?

Accepted Answer

They are absorbed by the shirt.

Question 7

Which part of the electromagnetic spectrum has the highest energy?

Accepted Answer

Gamma rays

Question 8

If the principal quantum number $$n$$ increases, what happens to the size of the orbital?

Accepted Answer

It increases.

Question 9

How many electrons can occupy a single d-orbital?

Accepted Answer

10

Question 10

Which orbital among $$3p$$, $$4s$$, and $$3d$$ gets filled first in a multi-electron atom?

Accepted Answer

$$3p$$

Question 11

What is Hund’s rule regarding the filling of orbitals?

Accepted Answer

Electrons fill orbitals singly with parallel spins before pairing.

Question 12

What is the electron configuration of chlorine using noble gas core notation?

Accepted Answer

$$[Ne]3s^2$ 3p^5$

Question 13

Sulfur has the electron configuration $$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^4. $$How many valence electrons and core electrons does it have?

Accepted Answer

6 valence, 10 core

Question 14

Which group in the periodic table contains elements with 5 valence electrons?

Accepted Answer

Group 5A

Question 15

Nitrogen in group 5A forms the $$N^{3-}$$ ion. What does this mean?

Accepted Answer

Nitrogen gains 3 electrons.

Question 16

Which quantum number describes the shape of an orbital?

Accepted Answer

Angular quantum number ($$l)$$

Question 17

If $$n = 2$$, what are the possible values for the angular quantum number $$l$$?

Accepted Answer

0 and 1

Question 18

Which color of visible light has the longest wavelength and which has the shortest?

Accepted Answer

Red has the longest, violet has the shortest.

Question 19

What happens when an electron in a hydrogen atom relaxes from a higher energy orbit to a lower energy orbit?

Accepted Answer

A photon of light is emitted.

Question 20

Which of the following best describes the relationship between wavelength and frequency for electromagnetic radiation?

Accepted Answer

They are inversely proportional.

Introductory Chemistry: Electrons in Atoms and the Periodic Table – Study Guidance

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