Answer
See the explanation
Work Step by Step
a. Sodium (Na) — Atomic number: 11
Full electron configuration:
$1s^2 2s^2 2p^63s^1$
Noble gas notation:
$[Ne]3s^1$
b. Silicon (Si) — Atomic number: 14
Full electron configuration:
$1s^2 2s^2 2p^63s^23p^2$
Noble gas notation:
$[Ne]3s^23p^2$
c. Iodine (I) — Atomic number: 53
Full electron configuration:
$1s^2 2s^2 2p^63s^23p^64s^23d^{10}4p^65s^24d^{10}5p^5$
Noble gas notation:
$[Kr]5s^24d^{10}5p^5$
