1)
Number of electron in Ne = 10
Ion has 5 more electrons than Ne.
So, number of electron in ion = 15
Since it has -1 charge, number of electron in element = 14
This is atomic number of Si.
So, ion is Si-
Answer: Si-
2)
Number of electron in Ne = 10
Ion has 5 more electrons than Ne.
So, number of electron in ion = 15
Answer: 15
3)
3p has 3 electrons
Answer: 3
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