Answer: The ion is
. The chemical symbol of the noble gas this ion is isoelectronic with Kr.
Explanation:
The given electronic configuration is,

The number of electrons = 2 + 2 + 6 + 2 + 6 = 18 electrons
As the ion has a charge of +2 , that means it has lost two electrons so the the neutral element will have 2 more electrons i.e 18+2 = 20. The element has atomic number of 20 and the element will be Calcium with electronic configuration of

Thus the symbol of ion is
. the nearest noble gas with 18 electrons is Krypton with symbol Kr.
<u>Answer:</u> The equilibrium partial pressure of NO is 0.0034 atm
<u>Explanation:</u>
For the given chemical equation:

The expression of
for above equation follows:

We are given:
Equilibrium partial pressure of
= 0.0159 atm
Equilibrium partial pressure of NOBr = 0.0768 atm

Putting values in above equation, we get:

Hence, the equilibrium partial pressure of NO is 0.0034 atm
Answer:
Answer: C
Melamine resin or melamine formaldehyde (also shortened to melamine) is a resin with melamine rings terminated with multiple hydroxyl groups derived from formaldehyde. This thermosetting plastic material is made from melamine and formaldehyde.
Melamine formaldehyde is a thermosetting plastic (or thermoset) that strengthens as it is heated during its preparation.