D. Fill up the blanks with the correct choice given in brackets.1. Ato

D. Fill up the blanks with the correct choice given in brackets.1. Atoms have a centrally placed nucleus and an extra nuclear part in which the (electron/proton) revolves.2. Atomic number is represented by(A/Z) and mass number is represented by(A/Z).3. The first shell (or K shell) can have a maximum of(2/8) electrons, and thesecond shell (or L shell) can have a maximum of ...(8/18) electrons.4. Particles with positive charge are known as .. .....(anions/cations).5. 2,8,8,2 is the electronic configuration of(calcium/potassium) and has (20/40) protons present in its nucleus.

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Explanation:

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