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?

NCERT Class X
Science - Science

Chapter_Periodic Classification of Elements

2

Answers

2015-06-02T14:37:16+05:30
B) MAGNESIUM has  EC 2,8,2
0
2015-06-02T14:48:03+05:30
Answer :
a. Helium, Neon, Argon, Krypton, Zenon, Radon.
b. Magnesium
c. Silicon
d. Boron
e. Beryllium
Hope you've got your answers. You could give that a 5 star and mark as the best answer.


0