Units
Electrons
Periodic Trends
Periodic Table
Definitions
100

This unit, affectionately called a "Chemist's Dozen", is equal to 6.022x1023 of something.

What is a mole?

100

He (Helium) has this many valence electrons.

What is 2?

100

This element has the higher ionization energy of He & K.

What is Helium?

100

This symbol represents an atom with 16 protons.

What is S?

100

This term is a measure of the physical size of an atom.

What is the atomic radius?

200

Volume is measured in these units.

What are liters?

200

Na (Sodium) has this many valence electrons.

What is 1?

200

This element of O, P, & S has the larger atomic radius.

What is P?

200

An aluminum atom with 13 electrons has this charge.

What is 0?

200

This term refers to the phenomenon in which electrons closer to the nucleus slightly repel electrons that are farther out.

What is shielding?
300

Speed of light is measured in these units.

What are meters per second?

300

O (Oxygen) has this many valence electrons.

What is 6?

300

This element of Ca, Br, & P has the larger atomic radius. 

What is Ca?

300

This is the molar mass of Cl (Chlorine).

What is 35.45 g/mol?

300

This term refers to the energy required to remove an electron from a gaseous atom or ion.

What is ionization energy?

400

Molarity measures this in these units.

What is concentration in moles per liter?

400

B (Boron) has this many core electrons.

What is 2?

400

This element of P, O, S, & Se has the higher ionization energy.

What is O?

400

Xe (Xenon) has this many protons.

What is 54?

400

This term refers to the change in energy associated with the addition of an electron to a gaseous atom or ion.

What is electron affinity?

500

These are the units for ε in the Beer-Lambert Law.

What are L(mol-1)(cm-1)? or M-1cm-1

500

Br (Bromine) has this many valence electrons.

What is 7?

500
This element of Se, Br, I, & Te has a higher electron affinity.

What is Br?

500

Mg2+ has this many electrons.

What is 10?

500

This term refers to the tendency of an atom to attract electrons in a bond to itself.

What is electronegativity?