Chemistry A Volatile History Test Episode 2

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

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


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