AFNS — AFNS Chemistry
Atomic Structure
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#25 Electronic configuration of Na (Z=11):
A) 1s2 2s2 2p6 3s1
B) 1s2 2s2 2p6 3s2
C) 1s2 2s2 2p5
D) 1s2 only
Answer: A
#26 Isoelectronic species have:
A) Same electron count
B) Same mass
C) Same neutrons
D) Same protons always
Answer: A
#27 Cation has:
A) Fewer electrons than protons
B) More electrons
C) Equal always
D) No nucleus
Answer: A
#28 Anion has:
A) More electrons than protons
B) Fewer electrons
C) No charge
D) No protons
Answer: A
#29 X-rays discovered by:
A) Roentgen
B) Curie
C) Dalton
D) Avogadro
Answer: A
#30 Quantum number n describes:
A) Principal energy level
B) Spin only
C) Shape only
D) Magnetic only
Answer: A
#31 l quantum number describes:
A) Orbital shape
B) Energy only
C) Spin
D) Nucleus size
Answer: A
#32 Maximum electrons in shell n=2:
A) 8
B) 2
C) 18
D) 32
Answer: A
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