Question

What is valence electrons 1.sodium ion 2. Oxide ion

Answer 1

atomic number:11
symbol: Na

Answer 2

1.Electronic configuration of sodium is 1s2 2s2 2p6 3s1

After removal of one electron ( Na+) electronic configuration will be

1s2 2s2 2p6

So, number of valence electrons will be - 8

2. Electronic configuration of sodium - 1s2 2s2 2p4

After gaining of two electrons (O2-) electronic configuration will be

1s2 2s2 2p6

So, number of valence electrons will be - 8

Hope it helps