Answer:
1.Most metal oxides are insoluble in water but some of these (e.g. Na2O.
Explanation:
2.: (i) A hissing sound is observed.
1.ii) The mixture starts boiling and lime water is obtained.
Based on the data given, the energy required to remove an electron from a hydrogen atom in the n = 11 state is -0.112 eV
<h3>What is ionization energy?</h3>
Ionization energy is the energy requiredto remove an electron from a neutral atom or a cation in its gaseous state.
To calculate the energy required to remove the electron from a hydrogen atom in the n = 11 state, the formula below is used:
where

substituting the values:

Therefore, the energy required to remove an electron from a hydrogen atom in the n = 11 state is -0.112 eV
Learn more about ionization energy at: brainly.com/question/1445179
Answer: [Kr] 5s24d10 is the element Cadmium, Cd. It has 48 electrons.