Modern periodic law and the periodic table — NEET & JEE Questions

Question 1 · difficulty L1 · recall

The modern periodic law states that properties of elements are periodic functions of their

• A. atomic numbers
• B. atomic masses only
• C. neutron numbers
• D. mass numbers only

Question 2 · difficulty L2 · understanding

If IUPAC name of an element is "Unununnium" then the element belongs to n th group of Periodic table. The value of n is ________.

Question 3 · difficulty L2 · understanding

In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right element, except noble gases, are respectively.

• A. lowest and lowest
• B. highest and lowest
• C. lowest and highest
• D. highest and highest

Question 4 · difficulty L2 · understanding

Consider the elements N, P, O, S, Cl and F. The number of valence electrons present in the elements with most and least metallic character from the above list is respectively.

• A. 7 and 5
• B. 6 and 7
• C. 5 and 7
• D. 5 and 6

Question 5 · difficulty L2 · understanding

Given below are two statements : Statement I : $\mathrm{K}>\mathrm{Mg}>\mathrm{Al}>\mathrm{B}$ is the correct order in terms of metallic character. Statement II : Atomic radius is always greater than the ionic radius for any element. In the light of the above statements, choose the correct answer from the options given below

• A. Both Statement I and Statement II are false
• B. Statement I is false but Statement II is true
• C. Statement I is true but Statement II is false
• D. Both Statement I and Statement II are true

Question 6 · difficulty L2 · understanding

$$\text { Match the LIST-I with LIST-II }$$ LIST-I (Family) LIST-II (Symbol of Element) A. Pnictogen (group 15) I Ts B Chalcogen II Og C Halogen III Lv D Noble gas IV Mc Choose the correct answer from the options given below:

• A. A-IV, B-I, C-II, D-III
• B. A-IV, B-III, C-I, D-II
• C. A-III, B-I, C-IV, D-II
• D. A-II, B-III, C-IV, D-I

Question 7 · difficulty L2 · understanding

Given below are two statements : Statement I : According to the Law of Octaves, the elements were arranged in the increasing order of their atomic number. Statement II : Meyer observed a periodically repeated pattern upon plotting physical properties of certain elements against their respective atomic numbers. In the light of the above statements, choose the correct answer from the options given below :

• A. Both Statement I and Statement II are false
• B. Statement I is false but Statement II is true
• C. Statement I is true but Statement II is false
• D. Both Statement I and Statement II are true

Question 8 · difficulty L2 · understanding

Given below are the atomic numbers of some group 14 elements. The atomic number of the element with lowest melting point is :

• A. 14
• B. 50
• C. 6
• D. 82

Question 9 · difficulty L2 · understanding

The element that does not belong to the same period of the remaining elements (modern periodic table) is:

• A. Platinum
• B. Osmium
• C. Iridium
• D. Palladium

Question 10 · difficulty L2 · understanding

Match List I with List II LIST I (Element) LIST II (Electronic Configuration) A. $$\mathrm{N}$$ I. $$[\mathrm{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^2 4 \mathrm{p}^5$$ B. $$\mathrm{S}$$ II. $$[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^4$$ C. $$\mathrm{Br}$$ III. $$[\mathrm{He}] 2 \mathrm{~s}^2 2 \mathrm{p}^3$$ D. $$\mathrm{Kr}$$ IV. $$[\mathrm{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^2 4 \mathrm{p}^6$$ Choose the correct answer from the options given below:

• A. A-IV, B-III, C-II, D-I
• B. A-I, B-IV, C-III, D-II
• C. A-III, B-II, C-I, D-IV
• D. A-II, B-I, C-IV, D-III