Electron Configuration
What does electron configuration show?
How electrons are arranged around an atom.
As you move from left to right across a period, does atomic radius generally increase or decrease?
Decrease.
What do the dots in a Lewis dot structure represent?
he dots in a Lewis dot structure represent an atom’s valence electrons
Which of the following is a molecular element?
A. Na
B. O₂
C. NaCl
D. CO₂
B. O₂
Write the electron configuration for neon.
1s² 2s² 2p⁶
Which has the larger atomic radius: Na or Cl? Why?
Na — atomic radius decreases from left to right across a period.
How many valence electrons does oxygen have? What does its Lewis Dot Structure look like
6 valence electrons
(look at board for ans)
What are Ionic vs Covalent compounds
Ionic: electrons are transferred; usually metal + nonmetal.
Covalent: electrons are shared; usually nonmetal + nonmetal.
What is the maximum number of electrons that can occupy an s, p, d, and f sublevel?
s = 2, p = 6, d = 10, f = 14.
What is effective nuclear charge?
how strongly an electron is attracted to the nucleus.
What is the octet rule?
Atoms tend to gain, lose, or share electrons to have 8 valence electrons.
What is the difference between paramagnetic and diamagnetic
Paramagnetic: has unpaired electrons.
Diamagnetic: has all electrons paired.
Write the noble-gas electron configuration for bromine (Br).
[Ar] 4s² 3d¹⁰ 4p⁵
Which element would you expect to have the effective nuclear charge: Na, Mg, Cl, or Ar?
Ar (Argon)
Draw the Lewis dot structure for chlorine (Cl)
look at board
How many atoms of each element are present in Al₂(SO₄)₃
Al = 2, S = 3, O = 12
An element has the electron configuration [Ar] 4s² 3d⁵. What element is it?
Manganese (Mn)
Rank these elements from smallest to largest atomic radius: Na, Mg, K, Ca.
Mg < Ca < Na < K
An element has 6 valence electrons. What group is it in, and how many unpaired electrons should appear in its Lewis dot structure?
Group 16; 2 unpaired electrons
What is the correct name for CaCl₂?
A. Calcium chlorine
B. Calcium chloride
C. Calcium dichloride
D. Calcium chlorate
B. Calcium chloride