Question Text
Question 4 :
An element has atomic number 15. Its valence electrons, group number and valency are respectively 
Question 8 :
The second electron gain enthalpies $$(in kJ {mol}^{-1})$$ of oxygen and sulphur respectively are :
Question 9 :
The electronic configuration of calcium is $$2,\,8,\,8,\,2$$. Find the valency of the element?
Question 12 :
As one moves along a given row in the Periodic Table, ionisation energy
Question 16 :
What is the dominant intermolecular force or bond that must be overcome in converting liquid <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea7f867a3d2442ab8292f28"> to a gas?
Question 19 :
Linear combination of two hybridized orbitals, belonging to two atoms and each having one electron leads to:
Question 20 :
As we move along a period, the valency of elements :
Question 23 :
Compound formed from the combination of an element X (atomic number 20) with the element Y (atomic number 17) is $$X_PY_Q$$. Find the value of P+Q.
Question 28 :
Atoms react to achieve an octet in the outermost shell. This is achieved by :
Question 29 :
The elements present in the core of earth are collectively known as