GROUP 1, 7, 0 , TRANSITION METALS AND THE HISTORY OF THE PERIODIC TABLE

what is the reactivity of group one metals? (does it increase/decrease down the group?)

The reactivity increases down the group

-the atoms get bigger

-so the outer electrons are further from the protons

-so the force beetween them is weaker

-so the electron is lost more easily

What are group one metals stored in?

Oil

Alkali metal + water = ???

metal hydroxide + hydrogen

Alkali metal + oxygen = ???

alkali metal oxide

Alkali metal + halogen (group 7) = ???

Alkali metal halide

what is the reactivity of group 7 halogens? (does it increase/decrease down the group?)

decreases as you go down the group

what is halogen displacement?

A reaction in which a more reactive halogen takes the place of a less reactive halogen from its compound.

EXAMPLE: chlorine + potassium bromide

potassium chloride + bromide

Where are the transition metals located?

In that large block between group 2 and 3

name all 4 physical properties' of transition metals (CSDM/B)

- good conductor of electricity and thermal energy

- hard and strong

- high density

- high melting points

what are chemical properties of transition metals?

- MUCH less reactive than the metals in group 1

what is the reactivity of noble gases (group 0)

Very unreactive

Because they all have complete outer shells, so they don't want to lose or gain electrons. (bros js a chill guy)

John Newlands (what was his thing called) (2 things he did and 2 howevers)

THE LAW OF OCTAVES

-ordered the elements in INCREASING ORDER OF ATOMIC MASS

- noticed every 8th element had similar properties

HOWEVER...

- he assumed that all the elements were found

- this rule only worked until calcium

Dmitri Mendeleev

-ordered the elements based on atomic weight

- if he needed to, he would switch the order of specific elements so they fitted the patterns

- he left gaps in his periodic table for elements that hadn't been discovered yet

- he even predicted the properties of the undiscovered elements (YES HE WAS THAT CONFIDENT)