Chemistry Chapter 2

John Dalton

First Atomic Theory

JJ Thomson

Plum Pudding Model

Rutherford

Nuclear Model

Bohr

Planetary Model

Schrodinger

Quantum Model

How do you find the neutrons?

Mass # - Atomic #

Mass # - Protons / Electrons

What’s the Atomic Number of 24/12 Mg

12 (Bottom Number)

What is an isotope and what does it change?

Same Atomic # / Protons / Electrons

Different Neutrons

Changes the mass and stability

Average Atomic Mass Formula

(mass x abundance)

make sure to convert percentages to decimals

What is a cation?

Positive Ion

Loses Electrons (makes it smaller)

What is an anion?

Negative Ion

Gained Electrons (makes it larger)

What happens to the radius if you go up or right?

It gets smaller

What happens to the ionization energy when you go up or right?

It increases.

Is it easier to form a positive ion with an element that has a high ionization energy or an element that has a low ionization energy?

Low ionization energy because it takes less energy.

Nonmetals are to the ___ of the stairstep

Right

Metalloids are ___ the stairstep

on

Metals are to the ___ of the stairstep

Left