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Atoms
Isotopes
Atomic History
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Atoms #2
100

The three subatomic particles within an atom

What are Protons Neutrons and Electrons?

100
If an atom has 12 protons and 15 neutrons, what is its isotope name?
Magnesium - 27
100

The first philosopher to consider that atoms were the smallest, indivisible unit of matter

Who is Democritus?

100
What do Carbon-12 and Carbon- 13 have in common?
Same number of protons (atomic number)..
100

The weighted average of all an element's isotopes

What is the atomic mass?

200

Where are protons located and what is their charge?

The nucleus, +1

200
If an element has 20 protons, 20 electrons, and 20 neutrons, What is its ATOMIC NUMBER?
20 Atomic Number = Number of Protons
200

The scientist who demonstrated Law of Conservation of Mass.

Who is John Dalton?

200
From its name, what do you know about Oxygen-22? (What does 22 stand for?)
Its mass number is 22.
200
why aren't electrons used to figure out the mass number of an atom?
Because electrons are too too small, they barley have any mass!
300

Where are electrons located and what is their charge?

Electron Cloud, outside the nucleus in the empty space, -1

300
An atoms Mass Number is 30.... Keeping in mind that the atomic number is 17, what can you tell about the atom? ((Hint: How do you find the number of neutrons?))
It has 13 neutrons.. mass number - atomic number = neutrons 30 - 17= 13
300

While playing with a cathode ray tube, J.J. Thompson discovered this subatomic particle

What is the electron?

300
Describe the relationship between protons and the atomic number.
They are the same numbers
300
Protons + Neutrons = ____________
Protons + Neutrons = the mass number of an atom
400

Where are neutrons located and what is their charge?

In the nucleus, 0

400
Neutral atoms always have an equal number of what two subatomic particles?
protons and electrons
400

Rutherford discovered this with the use of positive alpha particles during his gold foil experiment

What is the nucleus?
400
If you know the atomic number and the mass number of an isotope, how can you find out the number of NEUTRONS?
Mass # - Atomic # = neutrons
400

Why do atoms have an equal number of protons and electrons?

Because atoms have a neutral charge.

500

The periodic table is organizes elements by __________________, which is the same thing as the number of protons.

What is the atomic number?

500
Which about isotopes is true? a. they have the same number of neutrons b. they have a different atomic number c. they have the same number of protons
C. They have the same number of protons
500

The model that includes protons and neutrons in the center of the atom and electrons in electron clouds of empty space outside 

What is the Quantum Model?

500

Rutherford discovered the nucleus, but came back in 1920 and also discovered this subatomic particle

What is the proton?

500

Solve for the atomic mass of an element that has 2 isotopes 

The first isotope has an abundance of 69.399% with a mass of 63.9396 amu 

The second isotope has an abundance of 30.601% with a mass of 64.9278 amu

64.1896 amu