Question

From the symbol ₁₉K⁴⁰. write the following
1.mass number of Potassium
2.atomic number of Potassium
3.Write the distribution of electrons in an atom of Potassium.

Answer 1

1. Mass no. = 40

2. Atomic no. = 19

3. Electronic configuration = 2, 8, 8, 1

Hope it helps you out

Answer 2

₁₉K⁴⁰

mass number = 40

atomic number = 19

number of protons = number of electrons = atomic number = 19

number of neutrons = 40 - 19 = 21

1. mass number of potassium = 40

2. atomic number of potassium = 19

3. atomic number of potassium is 19. so, potassium has 19 electrons. maximum number electrons accommodated in the K-shell is 2. The second orbit will fill up to 8 electrons. third orbit will also fill up to 8 electrons and fourth orbit will accommodate rest of electrons left.

so, electronic configuration = 2, 8, 8, 1