Answer:
(a)
Atomic number = Number of protons = 8
(b) Atomic mass = Number of protons + Number of neutrons = 8 + 10 = 18 u
(c) Valence electrons = 6
(d) Valency of 'X' =8-6=2
(e) 'X' should be non-metal because there are six valence electrons hence
it will take two more electrons to complete its outer most shell.
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