The element with a completely filled p-subshell is:
1 answer:
The element with the completely filled p-subshell is Ar (Option C)
<h3>What is electronic configuration?</h3>This is the arrangement of elecartons in the atomic orbitals of an element. The modern electronic configuration makes use of the s, p, d, f orbital notation where
- Sharp (s) = Maximum of 2 electrons
- Principal (p) = Maximum of 6 electrons
- Diffuse (d) = Maximum of 10 electrons
- Fundamental (f) = Maximum of 14 electrons
To obtain the correct answer, we shall write the electronic configuration of each element given in the question. This is illustrated below
- Na (11) => 1s² 2s²2p⁶ 3s¹
- P (15) => 1s² 2s²2p⁶ 3s²3p³
- Ar (18) => 1s² 2s²2p⁶ 3s²3p⁶
- Al (12) => 1s² 2s²2p⁶ 3s²
From the above illustrations, we can see that only Ar has completely filled p-subshell.
Thus, Ar (Option C ) is the correct answer to the question
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Answer:
molality of sodium ions is 1.473 m
Explanation:
Molarity is moles of solute per litre of solution
Molality is moles of solute per kg of solvent.
The volume of solution = 1 L
The mass of solution = volume X density = 1000mL X 1.43 = 1430 grams
The mass of solute = moles X molar mass of sodium phosphate = 0.65X164
mass of solute = 106.6 grams
the mass of solvent = 1430 - 106.6 = 1323.4 grams = 1.3234 Kg
the molality =
Thus molality of sodium phosphate is 0.491 m
Each sodium phosphate of molecule will give three sodium ions.
Thus molality of sodium ions = 3 X 0.491 = 1.473 m