Recall that for a neutral element, Atomic number = # of protons = # of electrons.
The atomic number of He is 2 and since it’s a neutral element, this means He has 2 electrons.
The location of He in the periodic table is shown below:
Based on the figure, Ni belongs in the s-block in Period 1 so its electron configuration will only contain the 1s subshell. Recall that:
• s–subshell can hold a maximum of 2 electrons
• p–subshell can hold a maximum of 6 electrons
• d–subshell can hold a maximum of 10 electrons
Write full orbital diagrams for each of the following elements.
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