Chemistry A Volatile History Test Episode 2
What instrument is used to see atoms?
Scanning Tunneling Microscope
What elements did he discover?
Silicon, thorium, selenium, and cerium
Salt is always made of what? ______ and ______ atoms
Sodium, chloride
They discovered cesium and rubidium using its ______
Spectrum
To be ____ atoms want a _____ outer shell
Stable, full
Why do elements behave as they do? Rutherford discovered what about atomic structure?
The nucleus
_______ is the heaviest known natural element
Uranium
Closest shell can hold...
2
Second can hold...
4
How many natural elements are there?
92
What was in Mendeleev's dream?
A large table displaying all the elements
Lithium, sodium and potassium are called _____ metals. How do they react with water?
Alkali, they get increasingly more violent and fizz and shoot sparks
Ramsey also discovered _______
Argon
Dalton proposed atoms have their unique ____ weights
Atomic
Cannizzaro finally produced precise _______ _____
Atomic weight
He combined ______ ______ and _____ to design his table
Atomic weight, properties
Kirchoff and Bunsen used spectroscopes to examine the _____ spectrum given off by elements
Color
Arranged in order of atomic weight, Newlands noted that every ______ element had _______ properties. He called this the law of _____
Eighth, similar, octaves
Bohr said _____ orbit the nucleus in fixed shells holding a set number
Electrons
______ fit into the gap left in Mendeleev's table
Gallium
Berzelius did what?
He was obsessed with imposing order on the elements
Ramsey dissolved Cavite to produce _____
Helium
The search for extraterrestrial elements led to the discovery of ______ using a spectroscope during an eclipse.
Helium
Berzelius had to make his own _______
Lab equipment
For Mendeleev's table to work he had to....
Leave gaps where he knew elements should be
Most of the elements in Mendeleev's table were...
Metals
The missing groups on the table were called the ______ _______ because they were aloof and in-reactive. Other such elements include neon and xenon.
Noble gases
Now the law of octaves is called the law of .....
Periodisity
Mosley used an X ray spectrometer to examine atoms. He measured X rays knocked off the copper atoms, and was able to measure the number of ______ in the nucleus
Protons
Dobereiner looked at elements chemical properties and _____. He noted there were groups of three called ______
Reactions, triads
1869, a _______ _______ called Mendeleev had the idea for the periodic table
Russian chemist
