A 'GROUP' in the modern periodic table represents:
A.
A horizontal row where atomic number increases by one each step
B.
A vertical column; all elements in a group have the same number of valence electrons and same general electronic configuration of the outermost shell, hence similar chemical properties
C.
All elements having the same atomic mass
D.
Elements with identical number of neutrons in their nuclei
B. A vertical column; all elements in a group have the same number of valence electrons and same general electronic configuration of the outermost shell, hence similar chemical properties
14.
NCERT Exercise Q3.5: Locate the element with Z = 114 in the periodic table.
A.
Period 6 and Group 14
B.
Period 7 and Group 14 (p-block) — element Flerovium (Fl); configuration [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p²
B. Period 7 and Group 14 (p-block) — element Flerovium (Fl); configuration [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p²
15.
Where is HYDROGEN placed in the modern periodic table, and why is it anomalous?
A.
Hydrogen is placed in Group 17 exclusively due to its non-metallic nature
B.
Hydrogen is placed in Group 18 as it is a noble gas
C.
Hydrogen is placed in Group 1 (with alkali metals) but is anomalous — it also resembles halogens (Group 17) as it can gain one electron to form H⁻ and is a non-metal
D.
Hydrogen has no fixed position — it belongs to all groups simultaneously
C. Hydrogen is placed in Group 1 (with alkali metals) but is anomalous — it also resembles halogens (Group 17) as it can gain one electron to form H⁻ and is a non-metal
16.
The s-BLOCK of the modern periodic table comprises:
A.
Groups 13 to 18 — the p-block elements
B.
Groups 3 to 12 — the transition metals
C.
The lanthanides and actinides — f-block elements
D.
Groups 1 and 2 (alkali metals and alkaline earth metals) — their valence electrons are in the s-orbital; general configurations ns¹ (Group 1) and ns² (Group 2)
D. Groups 1 and 2 (alkali metals and alkaline earth metals) — their valence electrons are in the s-orbital; general configurations ns¹ (Group 1) and ns² (Group 2)
17.
The p-BLOCK elements in the modern periodic table include:
A.
Groups 1 and 2 — alkali and alkaline earth metals
B.
Only Group 18 — noble gases
C.
Groups 3 to 12 — transition elements
D.
Groups 13 to 18 — elements whose outermost electrons occupy the p-orbital; configurations ns²np¹ to ns²np⁶
