Question

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 the
second 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.​

Answer 1

Answer:

1-electrons

2-Z & A

3- 2 & 8

4-anions

5-Calcium & 20