Question

Which element has
(a) two shells, both of which are completely filled with electrons?
(b) the electronic configuration 2, 8, 2?
(c) a total of three shells, with four electrons in its valence shell?
(d) a total of two shells, with three electrons in its valence shell?
(e) twice as many electrons in its second shell as in its first shell?
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Answer 1

Answer:

a)2,8 - neon

b)Magnesium

c)2,8,4 - silicon

d)2,3 - Boron

e)2,4 - carbon

Answer 2

Answer:

(a) Neuron

(b) Magnesium