# Periodicity and Atomic Structure

## 17 terms · Periodicity and Atomic Structure, Ionic Bonds and Some Main Group Chemistry, Formulas, Equations and Moles

### what is the equation for energy?

E=hv or E=hc/(lambda)

### From high energy to low energy name the electromagnetic radiation

Gamma, X-rays, Ultraviolet, Visible, Infrared, Microwaves, Radio waves

### From longest wavelength to shortest name the electromagnetic radiation

Radio, Microwaves, Infrared Visible, Ultraviolet, X-rays, Gamma

### Balmer-Rydberg equation

1/(lambda)=R[1/(m^2)-1/(n^2)]
m= where an electron ended up
n=where an electron started

### Principal Quantum Number

symbolized by n, indicates the main energy level occupied by the electron

### Angular Momentum Quantum Number

the quantum number that indicates the shape of the orbital

### Magnetic Quantum Number

Gives the orientation in 3-dimensional space

spherical

dumbbell shaped

### Pauli Exclusion Principal

no two electrons in the same atom can have the same set of four quantum numbers

### Aufbau Principle

electrons enter orbitals of lowest energy first, each orbital can only hold 2 electrons and the electrons must have opposite spins

### Hunds rule

If 2 or more orbitals have the same energy, 1 electron goes into each orbital until all are half filled then start pairing electrons with opposite spins

### What is the period trend with respect to size?

The size of an atom increases going down a group, the size of an atom decreases going across a period (left to right)

### How do you do electron configuration of ions?

For main group elements you add or remove electrons to get a noble gas configuration.
For ex: Na=[Ne] 3s^1
Na+=[Ne]

### Ionization energy

the amount of energy required to remove an electron from an atom

### what it the ionization energy trend?

decreases going down a group, increases left to right across the periodic table

### Electron affinity

The amount of energy required to add an electron to an isolated atom in the gas phase