Chemistry Periodic Table Trends

How do you find number of neutrons?

Subtracting number of protons from atomic mass.

How to find number of protons?

The atomic number.

How to find number of electrons?

Will always be the same number as protons as long as it’s neutral.

What is nuclear charge?

The amount of protons

What is shielding effect?

The amount of energy levels/shells/orbitals

What is ionization energy?

The minimum amount of energy required to remove the most loosely bound valence electron.

What is atomic radius?

The total distance from the center of an atom's nucleus to its outermost electron shell.

What is electronegativity?

An atom's ability to pull shared electrons toward itself when forming a chemical bond.

What happens to atomic radius across a period?

Decreases

What happens to atomic radius down a group?

Increases

What happens to Ionization across a period?

Increases

What happens to ionization down a group?

Decreases

What happens to electronegativity across a period?

Increases

What happens to electronegativity down a group?

Decreases

What is a Bohr model look like?

What is a Lewis Dot structure look like?

What is electron configuration?

What is the percent error formula?

Why are some elements unstable and highly reactive compared to others? (Ex. Helium is stable and Hydrogen is unstable)