Atoms are composed of even smaller particles called
Protons. Electrons. Neutrons.
100
How many electrons are in a neutral oxygen atom?
(Hint: Oxygen has 6 protons)
8 electrons
200
A table of elements are arranged by increasing atomic number-not atomic mass.
Periodic Table
200
This group is special because its outer most energy level is full.
Group 18
200
The number after the element stand for...
Ex: Carbon-14
Mass Number
200
What two particles are found IN the nucleus.
Protons and Neutrons
200
How many neutrons are in Nitrogen-15?
(Hint Nitrogen has 7 protons)
9 neutrons
300
The small, positively charged center of an atom
Nucleus
300
The horizontal rows of elements
Periods
300
How many neutrons would be in Carbon-12?
(Hint: Carbon has 6 protons)
6
300
Where are the electrons located
Electron Cloud
300
How many moles are in 45 grams of Cu(NO3)2?
.36 mol Cu(NO3)2
400
Smaller particles the protons and neutrons
Quarks
400
Everything on the left side of the stair step is...
Metals
400
Magnesium has three isotopes, Mg−24, Mg−25, and Mg−26. The percentage of each in order is 78.70%, 10.13%, 11.17%. Calculate the relative atomic mass of Magnesium.
26.86%
400
What are the number of neutrons and protons in oxygen-15
7 neutrons. 7 neutrons. 8 protons.
400
How many atoms are in 35 grams of potassium?
5.39 x 10^23 atoms K
500
The sum of the masses of its isotopes, each multiplied by its natural abundance.
Average Atomic Mass
500
This increases across the periods of a periodic table
Atomic Number
500
Magnesium has three of it's own isotopes. 78.7% is Magnesium-24. 10.13% is Magnesium-25. 11.17% is Magnesium-26. Calculate the relative atomic mass of Magnesium,
24.32
500
Who was the scientist who was able to present evidence to suggest that atoms exist
John Dalton
500
Find the number of grams in 3.3 x 10^23 molecules of N2I6?