Question

1. which element has a 3p sublevel that contains 3 electrons?

a) phosphorus
b) sulfur
c) chlorine
d) argon

1. which element has a 4s sublevel with 2 electrons for its outermost electrons?

a) calcium
b) magnesium
c) beryllium
d) strontium

1. which element has 1 electron in its 3d sublevel?

a) scandium
b) titanium
c) vanadium
d) chromium

1. which element has 5 electrons in its 5p sublevel?

a) iodine
b) xenon
c) tellurium
d) antimony

1. which element has a completely filled 3p sublevel for its outermost electrons?

a) argon
b) neon
c) krypton
d) xenon

1. which element has 2 electrons in its 6p sublevel?

a) lead
b) bismuth
c) polonium
d) thallium

1. which principal quantum number is used to determine the row of an element on the periodic table?

a) the number of protons in the nucleus
b) the number of neutrons in the nucleus
c) the principal quantum number of the outermost electrons
d) the atomic mass of the element

Explanation:

1. Use electron configuration: Phosphorus is [Ne] 3s²3p³, so its 3p sublevel has 3 electrons.
2. Check outermost electron configurations: Strontium is [Kr] 5s², its outermost 5s (not 4s) is wrong; wait, Calcium is [Ar] 4s², its outermost sublevel is 4s with 2 electrons.
3. Scandium's electron configuration is [Ar] 4s²3d¹, so it has 1 electron in 3d.
4. Iodine's electron configuration is [Kr] 4d¹⁰5s²5p⁵, so its 5p sublevel has 5 electrons.
5. Argon's electron configuration is [Ne] 3s²3p⁶, its outermost 3p sublevel is completely filled.
6. Lead's electron configuration is [Xe] 4f¹⁴5d¹⁰6s²6p², so it has 2 electrons in 6p.
7. The row (period) of an element on the periodic table matches the principal quantum number of its outermost electrons.

Answer:

1. a) Phosphorus
2. a) Calcium
3. a) Scandium
4. a) Iodine
5. a) Argon
6. a) Lead
7. c) The principal quantum number of the outermost electrons