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19 Cards in this Set

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Who published the first table of elements and when?

John Dalton in 1808

Who improved the first table of elements and when?

John Newlands in 1864

What did John Newlands do to the table elements?

Organised the elements by mass and noticed the properties of every 8th element seemed similar. (Law of Octaves)

Which russian chemist cracked the problem to give the periodic table and when?

Dmitri Mendeleev in 1869

What did Mendeleev do to give us the modern periodic table.

He placed them in order of their atomic weights so a periodic pattern in their properties could be seen. He also left gaps for new elements.

True: Do all elemtens fit in Mendeleev's pattern.

False e.g argon

Why was the law of Octaves refused?

Because there were exceptions

What does periodic mean!

The properties that repeat at certain intervals.

What determines an elements position in the periodic table?

It's atomic number

What determines an atoms chemical properties?

The number of electrons on the outer shell.

What does the group number represent?

The number of electrons on the outer shell.

What is the name of group 8 and why are they unreactive?

The noble gases because they have a full outer shell of electrons.

What is the name of group 1 and what are they?

Alkali Metals ~ reactive metals

What are the transition metals?

They are unreactive metals

Why are alkali metals stores under oil?

Because they react with oxygen.

True or false: group 1 metals have high boiling points.

False ~ they have low boiling points (weak bonds)

True or false: group 1 metals have low densities.

True ~ They float in water

What is group 7 and what determines their reactivity?

The halogens are toxic non-metals that determine their reactivity by their electronic structure.

What can a more reactive halogen displace?

A less reactive halogen.