Atomic Theory
Protons have the following charge....
Positive
How many neutrons has Calcium have?
20
Give core notation for:
Ru
[Kr]5s24d6
Al3+
[Ne]= [He]2s22p6
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.
Bromine has _____ protons
35
How many neutrons does chlorine have?
19
Give core notation for:
Pm
[Xe]6s24f5
Li+
[He]= 1s2
What is Ionization Energy?
the amount of energy required to remove an electron from an atom or molecule
Rhenium has ______ electrons
75
How many neutrons does Uranium-238 have?
146
Ln
[Kr]5s24d105p1
How many valence electrons?
Ge
4
Which atom has the smallest atomic radius?
Gold, Silver, Copper, Francium
Copper
An element has 33 protons and 42 neutrons. The element is....
As
An isotope of Lead has 125 neutrons. Its mass number is
207 amu
I-
[Kr]5s24d105p6
How many valence electrons?
S2-
0 valence electrons
Which has the smallest radius?
Oxygen atom
Oxygen ion
Fluorine atom
Fluorine ion
Fluorine ion
How many electrons are in the outer shell of Fe3+?
5
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.
As3-
[Ar]4s23d104p6
How many valence electrons?
Al
3
Which alkali metals have the highest first ionization energy?
Cesium
Francium
Potassium
Rubidium
Sodium
Sodium