Explain the position of hydrogen in the modern periodic table. Which group of the periodic table contains solid, liquid and gaseous elements? [2+1]
WBBSE
Class X
Physical Science
Periodic Table
03 Mark
2025
Position of Hydrogen
Hydrogen has the electronic configuration 1s¹.
- Like Group 1 (Alkali metals), it has one valence electron and can lose one electron to form H⁺.
- Like Group 17 (Halogens), it requires one electron to become stable and can gain one electron to form H⁻.
Therefore, hydrogen shows properties of both Group 1 and Group 17, and hence occupies a unique position in the modern periodic table.
Group 17 (Halogens) contains solid, liquid and gaseous elements:
- Fluorine (F₂) and Chlorine (Cl₂) – Gases
- Bromine (Br₂) – Liquid
- Iodine (I₂) and Astatine (At) – Solids
Related Questions
More WBBSE Moderate level questions
1/12
Q.
State Modern Periodic Law. Discuss the periodic trends of atomic radii for elements of Group...
A.
Modern Periodic Law The physical and chemical properties of elements are periodic...
Q.
Write the contribution of Mendeleef in the creation of the ‘periodic table’.
A.
Mendeleev's contributions to the creation of the periodic table include: Periodic Law:...
Q.
What is the important conclusion of Moseley’s experiment? What is the importance of this conclusion...
A.
From Moseley's experiment, it was concluded that the atomic number, and not...
Q.
What is meant by ionisation energy of an atom of an element? Arrange Na, Rb,...
A.
Ionisation energy is the amount of energy required to remove an electron...
Q.
The first three elements of group 16 of long periodic table are O, S, and...
A.
Atomic Radius: Se > S > O Electronegativity: O < S <...
Q.
How many groups are there in the modern long form of the periodic table?
A.
(d) 18 Explanation The modern long form of the periodic table consists...
Q.
Match the Right Column with the Left Column : 2.2.1 Metal present in German silver
A.
Left Column Correct Match 2.2.1 Metal present in German silver (d) Ni...
Q.
What is meant by the electronegativity of an element? How does the electronegativity of Group...
A.
Electronegativity is the tendency of an atom in a molecule to attract...
Q.
Match the right column with the left column: 2.11.1. Noble Gas (a) Cs2.11.2. Inver (b)...
A.
Left Column Right Column (1) Noble Gas (b) Rn (2) Inver (d)...
Q.
If the elements are arranged in ascending order of their electropositivity, then choose the correct...
A.
(b) C > N > 0 > F Explanation Electropositivity decreases from...
Q.
2.11.1. An alkaline earth metal (a) Fe 2.11.2. The metal which is present in the...
A.
2.11.1 → (c) Ca 2.11.2 → (a) Fe 2.11.3 → (d) K...
Q.
How many elements are there in the fourth period of long periodic table?
A.
b. 18 Explanation: The 4th period starts with Potassium (K, Z=19) and...