Stable electron configurations are likely to contain (1 point)
a. filled energy sublevels
b. fewer electrons than unstable configurations
c. unfilled s orbitals
d. electrons with a clockwise spin

Option (A) is the correct answer.

Explanation:

A stable electronic configuration will have completely filled energy sub levels. Completely filled sub levels correspond to noble gases which are less reactive and more stable.

The orbital closer to the nucleus will be filled first and later on the other orbitals will be filled.

Thus, we can conclude that stable electron configurations are likely to contain filled energy sub levels.

A. filled energy sublevels

Explanation:

The stable configurations of electrons are those that have the energy sublevels filled and correspond to the configutation of the noble gases which under normal conditions are unreactive because of their stable configurations. The configurations of noble gases up to Xe is given below , remember the s sublevel can accomodate a maximum of two electrons and the p 6 electrons

He configuration: 1s²

Ne  1s²2s²2p⁶

Ar  (Ne) 3s²3p⁶

Kr  (Ar) 4s²4p⁶

Xe (Kr) 4d¹⁰5s²5p⁶

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.