Question 1

Which of the following statements is NOT a part of the modern atomic theory?

Accepted Answer

Atoms of a given element are identical in mass and properties.

Question 2

Which subatomic particle determines the identity of an element?

Accepted Answer

Proton

Question 3

A neutral atom has 17 protons and 18 neutrons. What is its nuclear symbol?

Accepted Answer

$$^{35}_{17}\mathrm{Cl}$$

Question 4

Which of the following best describes isotopes?

Accepted Answer

Atoms with the same number of protons but different numbers of neutrons.

Question 5

Calculate the number of neutrons in an atom of phosphorus with atomic number $$Z = 15$$ and mass number $$A = 31.$$

Accepted Answer

$$16$$

Question 6

Which group on the periodic table contains elements that are colorless, inert gases?

Accepted Answer

Group 8A

Question 7

What is the electron configuration for a neutral atom of oxygen ($$Z = 8$$)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^4$$

Question 8

Which of the following elements is a metalloid?

Accepted Answer

Ge (Germanium)

Question 9

A sample of copper contains 69.09% $$^{63}\mathrm{Cu} ($$mass = 62.9298 amu) and 30.91% $$^{65}\mathrm{Cu} ($$mass = 64.9278 amu). What is the atomic weight of copper?

Accepted Answer

$$63.55$$ amu

Question 10

Which of the following best explains why elements in the same group have similar chemical properties?

Accepted Answer

They have the same number of valence electrons.

Question 11

Which of the following is the correct condensed electron configuration for zinc ($$Z = 30$$)?

Accepted Answer

$$[Ar] 4s^2$ 3d$$^{10}$$

Question 12

Which of the following statements about the quantum mechanical model of the atom is TRUE?

Accepted Answer

Electrons are restricted to certain energy levels and locations.

Question 13

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

Accepted Answer

$$18$$

Question 14

Which of the following is a property of alkali metals (Group 1A)?

Accepted Answer

They are shiny, soft metals with low melting points.

Question 15

What is the maximum number of electrons that can occupy a single p orbital?

Accepted Answer

$$2$$

Question 16

Which of the following elements is a halogen?

Accepted Answer

Chlorine (Cl)

Question 17

Which of the following best describes the relationship between atomic number ($$Z$$), mass number ($$A$$), and the number of neutrons ($$n$$)?

Accepted Answer

$$A = Z + n$$

Question 18

Which of the following is the correct electron-dot symbol for magnesium (Mg)?

Accepted Answer

Mg with two dots on one side

Question 19

Which of the following is a characteristic of transition metals?

Accepted Answer

They are found in the middle of the periodic table and often form colored compounds.

Question 20

Which of the following best explains why fireworks display different colors?

Accepted Answer

Different metals emit light at specific wavelengths when excited.

Ch. 2 Lecture Notes: Atoms and the Periodic Table: Structure, Properties, and Classification

Study Guide - Practice Questions

Study Guide - Flashcards