Complete the table with the number of protons, electrons, neutrons, and atomic mass for the given elements/ions.

4. Copy and complete the table below:

Element/ion	No of proton	No of electron	No of neutron	Atomic mass
X-	9	10	10	19
Y2+	20	18	20	40
P+	11	10	12	23
Q-	17	18	18	35

• Explanation for table completion:
  • X-: Given 10 electrons and 10 neutrons. Since it's X-, it has 1 more electron than protons. So, protons = 10 - 1 = 9. Atomic mass = protons + neutrons = 9 + 10 = 19.
  • Y2+: Given 20 protons and 20 neutrons. Since it's Y2+, it has 2 fewer electrons than protons. So, electrons = 20 - 2 = 18. Atomic mass = protons + neutrons = 20 + 20 = 40.
  • P+: Given 11 protons and 12 neutrons. Since it's P+, it has 1 fewer electron than protons. So, electrons = 11 - 1 = 10. Atomic mass = protons + neutrons = 11 + 12 = 23.
  • Q-: Given 17 protons and atomic mass 35. Neutrons = Atomic mass - protons = 35 -