ANALYZE IT 1. What is a nebula?

2. What effect might a supernova have had on the material in a nebula that led to the creation of our solar system?

3. Does nuclear fusion combine or break apart hydrogen (H) atoms to form helium (He) atoms? Does nuclear fusion release or
absorb energy?

4. What percentage of the matter in the solar system does the sun contain? What does that statistic tell you about our sun?

5. What role did gravity play in the formation of the solar system?

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Explanation:

the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.

- lead + phosphoric acid = hydrogen + lead(ii) phosphate