Q: If the wavelength of light emitted in the Level 4 → Level 2 transition is 486 nm, what is the frequency of this light? (Use $$c = \lambda \nu$$, $$c = 2.998 \times 10^8$ m/s)

$$\nu = 6.16 \times 10$$^{14}$$ Hz

Q: If the speed of light is $$c = 2.998 \times 10^8$ m/s and the wavelength of blue light is 410 nm, what is the frequency of this light?

$$\nu = 7.31 \times 10$$^{14}$$ Hz

Question 1

Which transition in the hydrogen atom's Balmer series emits light of the lowest frequency?

Accepted Answer

Level 3 → Level 2

Question 2

According to the periodic trends shown, what happens to atomic radius as you move down a group in the periodic table?

Accepted Answer

Atomic radius increases due to addition of electron shells.

Question 3

Which property increases as you move across a period from left to right in the periodic table?

Accepted Answer

First ionization energy

Question 4

What is the reason for the increase in first ionization energy as you move across a period?

Accepted Answer

Increase in effective nuclear charge

Question 5

Which transition in the Balmer series emits the highest energy photon?

Accepted Answer

Level 6 → Level 2

Question 6

If the wavelength of light emitted in the Level 4 → Level 2 transition is 486 nm, what is the frequency of this light? (Use $$c = \lambda 
u$$, $$c = 2.998 	imes 10^8$ m/s)

Accepted Answer

$$
u = 6.16 	imes 10$$^{14}$$ Hz

Question 7

Which of the following best explains why metallic character increases as you move down a group?

Accepted Answer

Ionization energy decreases, making it easier for atoms to lose electrons.

Question 8

Which element would have the highest first ionization energy among the following: Na, Mg, Al, Si?

Accepted Answer

Si

Question 9

What is the relationship between energy and wavelength for electromagnetic radiation?

Accepted Answer

Energy is inversely proportional to wavelength: $$E = \frac{hc}{\lambda}$$

Question 10

Which of the following transitions in the hydrogen atom would emit light in the visible region?

Accepted Answer

Level 6 → Level 2

Question 11

If the energy of a photon emitted in the Level 5 → Level 2 transition is $$E = 4.58 	imes 10$$^{-19}$$ J, what is the wavelength of the photon? (Use E = h$$
u$$ and c$$ = \lambda 
u$$)

Accepted Answer

$$\lambda = 434 nm$$

Question 12

Which property does NOT have a definite trend as you move down a group in the periodic table?

Accepted Answer

Electron affinity

Question 13

Why does atomic radius decrease as you move across a period?

Accepted Answer

Effective nuclear charge increases, pulling electrons closer.

Question 14

Which of the following best describes the trend in electron affinity across a period?

Accepted Answer

Electron affinity becomes more negative due to increased effective nuclear charge.

Question 15

Which transition in the hydrogen atom's Balmer series corresponds to the emission of red light?

Accepted Answer

Level 3 → Level 2

Question 16

If the speed of light is $$c = 2.998 	imes 10^8$ m/s and the wavelength of blue light is 410 nm, what is the frequency of this light?

Accepted Answer

$$
u = 7.31 	imes 10$$^{14}$$ Hz

Question 17

Which of the following statements about the periodic trends is correct?

Accepted Answer

Metallic character decreases across a period due to increasing ionization energy.

Question 18

Which transition in the hydrogen atom's Balmer series emits light in the violet region?

Accepted Answer

Level 6 → Level 2

Question 19

What is the main reason for the decrease in metallic character as you move across a period?

Accepted Answer

Ionization energy increases, making it harder for atoms to lose electrons.

Question 20

Which property is directly related to the ease with which an atom loses an electron?

Accepted Answer

First ionization energy

General Chemistry I: Comprehensive Study Guide

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