Atomic Theory

Ions and Isotopes

Electron Configurations

Ions and valence e-

Periodic trends

100

Protons have the following charge....

Positive

100

How many neutrons has Calcium have?

100

Give core notation for:

Ru

[Kr]5s²4d⁶

100

Al3+

[Ne]= [He]2s²2p⁶

100

What is the atomic radius?

The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons.

200

Bromine has _____ protons

200

How many neutrons does chlorine have?

200

Give core notation for:

Pm

[Xe]6s²4f⁵

200

Li+

[He]= 1s²

200

What is Ionization Energy?

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

300

Rhenium has ______ electrons

300

How many neutrons does Uranium-238 have?

146

300

[Kr]5s²4d¹⁰5p¹

300

How many valence electrons?

300

Which atom has the smallest atomic radius?
Gold, Silver, Copper, Francium

Copper

400

An element has 33 protons and 42 neutrons. The element is....

400

An isotope of Lead has 125 neutrons. Its mass number is

207 amu

400

I-

[Kr]5s²4d¹⁰5p⁶

400

How many valence electrons?
S2-

0 valence electrons

400

Which has the smallest radius?
Oxygen atom
Oxygen ion
Fluorine atom
Fluorine ion

Fluorine ion

500

How many electrons are in the outer shell of Fe3+?

500

Example #1: Calculate the average atomic weight for carbon.

mass number isotopic weight percent abundance

12 12.000000 98.93

13 13.003355 1.07

To calculate the average atomic weight, each isotopic atomic weight is multiplied by its percent abundance (expressed as a decimal). Then, add the results together and round off to an appropriate number of significant figures.

(12.000000) (0.9893) + (13.003355) (0.0107) = 12.0107 amu

This is commonly rounded to 12.011 or sometimes 12.01.

500

As3-

[Ar]4s²3d¹⁰4p⁶

500

How many valence electrons?

500

Which alkali metals have the highest first ionization energy?

Cesium
Francium
Potassium
Rubidium
Sodium

Sodium