Question 1

Which of the following statements about Mendeleev's periodic table is correct?

Accepted Answer

Mendeleev arranged elements by increasing atomic mass.

Question 2

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons.

Question 3

Which equation correctly relates the energy of a photon to its frequency?

Accepted Answer

$$E = h 	imes 
u$$

Question 4

Which property is NOT typically associated with metals?

Accepted Answer

Brittleness

Question 5

Which of the following elements is a metalloid in Group 5A?

Accepted Answer

Arsenic

Question 6

What is the principal quantum number ($$n) $$for the third energy level?

Accepted Answer

$$n = 3$$

Question 7

Which statement about atomic orbitals is correct?

Accepted Answer

An atomic orbital is a region of space where there is a high probability of finding an electron.

Question 8

Which formula correctly relates the speed of light ($$c$$), wavelength ($$\lambda$$), and frequency ($$
u$$)?

Accepted Answer

$$c = \lambda 	imes 
u$$

Question 9

Which of the following best describes the emission spectrum of hydrogen?

Accepted Answer

A series of discrete lines corresponding to specific wavelengths.

Question 10

Which element in Group 5A is classified as a metal?

Accepted Answer

Bismuth

Question 11

Which of the following statements about the periodic table is always true?

Accepted Answer

Most elements in the periodic table are metals.

Question 12

Which of the following is the correct definition of atomic number?

Accepted Answer

The number of protons in the nucleus of an atom.

Question 13

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

Accepted Answer

Electronegativity

Question 14

Which of the following best describes a continuous spectrum?

Accepted Answer

A spectrum that contains all wavelengths of visible light.

Question 15

Which of the following is NOT a property of metals?

Accepted Answer

Poor conductor of heat

Question 16

If an atom has 15 protons, 16 neutrons, and 15 electrons, what is its mass number?

Accepted Answer

$$31$$

Question 17

Which of the following best describes the relationship between wavelength ($$\lambda) $$and frequency ($$
u) $$for electromagnetic radiation?

Accepted Answer

As wavelength increases, frequency decreases.

Question 18

Which of the following is the correct electron configuration for a neutral nitrogen atom?

Accepted Answer

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

Question 19

Which of the following statements about elements in the same group is correct?

Accepted Answer

They have similar chemical properties.

Question 20

A hospital uses electromagnetic radiation to sterilize medical equipment. Which type of radiation is most likely used for this purpose?

Accepted Answer

Ultraviolet light

Unit 3 Study Guide: Atomic Structure and the Periodic Table

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