Among the elements of the main group, the general trend in the first ionization energy moving across a period is not followed between group 2 and group 13. Which best explains these exceptions? The ionization energy decreases because the full s orbital shields the electron entering the p orbital. The ionization energy increases because the full s orbital shields the electron entering the p orbital. The ionization energy decreases because the stability of the half-full p subshell is increased. The ionization energy increases because the stability of the half-full p subshell is increased.

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Explanation:

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

plz give brainliest

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.