2. When atoms of sodium (Na) and chlorine (CI)
combine to form salt (NaCl), the Nation is smaller
than the Na atom, while the Cl ion is larger than
the Cl atom. Why?

A The Na and Cl atoms both lost electrons.
B The Na and Cl atoms both gained electrons.
C The Na atom lost an electron, while the Cl
atom gained an electron.
D The Na atom gained an electron, while the CI
atom lost an electron.
5.

coral.

explanation:

coral. many marine organisms that produce calcium carbonate shells or skeletons are negatively impacted by increasing co2 levels and decreasing ph in seawater.

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.