Atomic Structure Worksheet
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16Atomic Structure
___ 1. What is the total number of electrons in the 2p sublevel of a chlorine atom in the
ground state? (1) 6; (2) 2; (3) 3; (4) 5.
2
1
___ 2. Which is the electron configuration of an atom in the excited state?
(1) 1s
,2s
;
2
2
1
2
2
5
2
2
2
1
(2) 1s
,2s
,2p
; (3) 1s
,2s
,2p
; (4) 1s
,2s
,2p
,3s
.
___ 3. A Ca (+2) ion differs from a Ca atom in that the Ca (2+) ion has (1) more protons;
(2) fewer protons; (3) more electrons; (4) fewer electrons.
___ 4. At the end of 12 days, 1/4 of an original sample of a radioactive element remains.
What is the half-life of the element? (1) 24 days; (2) 48 days; (3) 3 days; (4) 6
days.
___ 5. The total number of orbitals in the 4f sublevel is (1) 1; (2) 5; (3) 3; (4) 7.
___ 6. Which electron transition is accompanied by the emission of energy?
(1) 1s to 2s;
(2) 2s to 2p; (3) 3p to 3s; (4) 3p to 4p.
___ 7. What is the total number of nucleons (protons and neutrons) in an atom of selenium
(atomic no.=34, atomic mass= 79)? (1) 34; (2) 45; (3) 79; (4) 113.
___ 8. What is the total number of principal energy levels that are completely filled in an
atom of magnesium in the ground state? (1) 1; (2) 2; (3) 3; (4) 4.
___ 9. What is the maximum number of electrons that can occupy the 4d sublevel?
(1) 6;
(2) 2; (3) 10; (4) 14.
___ 10. Which sublevels are occupied in the outermost principal energy level of an argon
atom in the ground state? (1) 3s and 3d; (2) 3s and 3p; (3) 2s and 3p; (4) 2p and
3d.
2
2
___ 11. Which electron configuration represents an atom in the excited state?
(1) 1s
,2s
;
2
1
2
2
5
2
2
6
(2) 1s
,3p
; (3) 1s
,2s
,2p
; (4) 1s
,2s
,2p
.
___ 12. Which element has an atom in the ground state with the most loosely bound
electron? (1) He; (2) As; (3) Xe; (4) Cs.
___ 13. The half-life of C-14 is 5730 years. What fraction of a 1 gram sample of C-14 would
remain after 17,190 years? (1) 1/2; (2) 1/4; (3) 1/8; (4) 1/16.
___ 14. Isotopes of an element have a different
(1) number of electrons; (2) number of
protons; (3) atomic number; (4) mass number.
___ 15. A neutral atom of an element has an electron configuration of 2-8-2. What is the
total number of p electrons in this atom? (1) 6; (2) 2; (3) 10; (4) 12.
___ 16. A neutral oxygen atom (O) differs from an oxide ion in that the atom has (1) more
electrons; (2) fewer electrons; (3) more protons; (4) fewer protons.
___ 17. Which is the electron configuration of a hydrogen atom with an atomic mass of 3 in
1
2
2
1
2
2
the ground state? (1) 1s
; (2) 1s
; (3) 1s
,2s
; (4) 1s
,2s
.
Atomic Structure Questions
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