Answer: [He] 2s1
Explanation:
Electrons per shell: 2,1
Atomic number: 3
Electronegativity: 0.98
Atomic mass: 6.941 u
Discoverer: Johan August Arfwedson
Period: Period 2 element
Answer:
the electronic configuration of Li is
=》 2, 1
and in spdf configuration it's 1s^2 2s^1
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