Periodic Table
Periodic Trends
Element Identification
Mendeleev
Notes
100
What number tells you the number of protons and electrons?
Atomic Number
100
What is the 'brain' of the atom?
Nucleus
100
What is the name of element number 1?
Hydrogen
100

How many elements did Mendeleev have to work with? (how many notecards)

60 known elements

100
How many electrons fit on the first energy level?
2
200
How do you figure out the number of neutrons?
Subtract the atomic number from the atomic mass
200
What particle has a positive charge?
Proton
200
What element has an atomic mass of 238.
U, Uranium
200

How did Mendeleev arrange his periodic table?

in order of increasing atomic weight

200

Initially proposed the idea of a triad of elements

J.W. Doberwiner

300
How do you find an element's atomic mass?
Add the number of neutrons and the number of protons together
300
What particle has no charge?
Neutron
300
What is the name of the element with the elemental symbol Zr?
Zirconium
300

How many elements did Mendeleev predict?

5

300

These elements are in vertical columns

Groups

400
How many liquids are on the periodic table?
2
400
What particle has a negative charge?
Electron
400
Which element has 42 as its atomic number?
Mo, Molybdenum
400

What group of elements were missing from Mendeleev's original table?

Noble Gasses

400

These are arranged in horizontal rows with repeating trends

Periods

500
What does the term 'valence electrons' mean? (2 things)
number of electrons on outermost shell, tells how reactive an element is
500
What subatomic particle is not inside the nucleus?
Electrons
500
What element has the elemental symbol Yb?
Ytterbium
500

Which chemist did Mendeleev beat in publishing his paper 1 year sooner?

Lothar Meyer

500
What is an electron cloud model?
The electrons around the nucleus spinning so fast it looks like a cloud
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