Chemistry 9th Chap 5 : Topic 1 - Maryam Publications

Chemistry Chapter 5 : Topic 1

Noble Gas Stability

1 / 15

Which of the following statements best explains why atoms tend to achieve a noble gas electronic configuration during chemical reactions?

A) Noble gases have the smallest atomic sizes among all elements.

B) Noble gases possess completely filled valence shells which makes them chemically stable.

C) Noble gases have the highest number of protons in their nuclei.

D) Noble gases always lose electrons during chemical reactions.

2 / 15

An atom with electronic configuration 2,8,1 is most likely to behave chemically in which way according to the octet rule?

A) It will remain chemically inert like noble gases.

B) It will lose one electron to achieve the configuration of a noble gas.

C) It will share eight electrons with other atoms.

D) It will gain seven electrons to complete its outer shell.

3 / 15

Which of the following atoms follows the duplet rule instead of the octet rule when forming compounds?

A) Hydrogen

B) Oxygen

C) Nitrogen

D) Sodium

4 / 15

Which statement correctly describes the relationship between the octet rule and the chemical behavior of main group elements?

A) Main group elements form compounds in order to achieve eight electrons in their outermost shell.

B) Main group elements become stable only when their nuclei contain eight protons.

C) Main group elements always form ionic compounds to satisfy the octet rule.

D) Main group elements always lose electrons regardless of their valence shell.

5 / 15

Which of the following electronic configurations represents a noble gas configuration that other atoms try to achieve?

A) 2, 7

B) 2, 6

C) 2, 8, 1

D) 2, 8

6 / 15

An atom with six valence electrons is most likely to behave chemically in which manner according to the octet rule?

A) It will gain two electrons.

B) It will lose two electrons.

C) It will gain six electrons.

D) It will lose six electrons.

7 / 15

Which statement best explains why noble gases show very low chemical reactivity?

A) Their nuclei are unstable.

B) Their atoms contain equal numbers of neutrons and protons.

C) Their outermost electron shells are completely filled.

D) They possess maximum atomic masses.

8 / 15

An atom with electronic configuration 2, 8, 7 will most likely react by:

A) sharing seven electrons with other atoms

B) losing one electron to follow the duplet rule

C) gaining one electron to achieve a noble gas configuration

D) losing seven electrons to achieve stability

9 / 15

Which of the following best demonstrates the application of the octet rule in predicting chemical bonding?

A) Atoms combine only when their nuclei become stable.

B) Atoms combine only when they have equal atomic masses.

C) Atoms react to maximize their atomic number.

D) Atoms combine so that each atom obtains a stable noble gas configuration.

10 / 15

Why does sodium readily form Na⁺ ions during chemical reactions?

A) Sodium atoms gain one electron to follow the duplet rule.

B) Sodium atoms share electrons equally with noble gases.

C) Sodium atoms lose one electron to achieve a noble gas configuration.

D) Sodium atoms gain seven electrons to complete an octet.

11 / 15

Which pair of elements is most likely to form a compound based on the octet rule due to complementary electron transfer?

A) Argon and Krypton

B) Sodium and Chlorine

C) Neon and Argon

D) Helium and Neon

12 / 15

Which of the following statements correctly compares the duplet rule with the octet rule?

A) The duplet rule requires atoms to gain eight electrons.

B) The octet rule applies only to noble gases.

C) The duplet rule applies mainly to atoms with only one electron shell.

D) Both rules apply to all elements in the periodic table.

13 / 15

Which of the following atoms already possesses a stable electronic configuration and therefore rarely forms chemical compounds?

A) Oxygen (2, 6)

B) Neon (2, 8)

C) Sodium (2, 8, 1)

D) Chlorine (2, 8, 7)

14 / 15

Which situation best illustrates the predictive power of the octet rule in chemistry?

A) Determining the number of neutrons in a nucleus.

B) Determining the color of an element.

C) Predicting how atoms combine to form compounds.

D) Calculating atomic mass of elements.

15 / 15

An element belonging to Group 17 typically has seven valence electrons. According to the octet rule, such an element will most likely:

A) lose seven electrons

B) remain chemically inert

C) gain seven electrons

D) gain one electron

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