Calculate the number of gram atoms in 4.6 grams of sodium (Na = 23)

Calculate the percentage of water of crystallization in CuSO₄.5H₂O
(H = 1, O = 16, S = 32, Cu = 64)

A compound of X and Y has the empirical formula XY₂. Its vapour density is equal to its empirical formula weight. Determine its molecular formula.

Match the atomic number 2, 4, 8, 15 and 19 with each of the following:
(i) A solid non-metal belonging to the third period.
(ii) A metal of valency 1.
(iii) A gaseous element with valency 2.
(iv) An element belonging to Group 2.
(v) A rare gas.

35.

Arrange the following as per the instruction given in the brackets:
He, Ar, Ne (Increasing order of the number of electron shells)

Arrange the following as per the instruction given in the brackets:
Na, Li, K (Increasing Ionisation Energy)

Arrange the following as per the instruction given in the brackets:
F, Cl, Br (Increasing electronegativity)

Arrange the following as per the instruction given in the brackets:
Na, K, Li (Increasing atomic size)

State the type of Bonding in the following molecule:
Water

State the type of Bonding in the following molecule:
Calcium oxide