What is he created the first periodic law. Ordered by atomic masses, same behaviors in same groups, and he predicted the existence and properties of three new elements. Problem. Some elements were out of mass order
100
1
What is alkali metals
100
Metal properties.
What is hard, dense silver grayish, soild except hg, malleable, shiny , good conductors , ductile, high boiling points.
100
coinage metals
What is not very reactive, 2 gases, 1 liquid, 1 solid, no metals
200
Moseley?
What is he fixed Mendeleev;s problem. Atomic number/ protons.
200
group 2
What is alkaline earth metals
200
non-metal props
What is not malleable, brittle, not ductile, not good conductors, solids liquieds and gases, low mp and low bp
200
noble gases
What is inert, non reactive, stable.
300
What is the periodic Law?
What is the chemical and physical properties of the elements are a periodic propert of their atomic number
300
group 11
What is coinage metals
300
metalloids
What is properties of both, semi-conductors
300
Ionization energy
What is energy needed to remove an e- from an atom.
Down a group decreases due to nuclear charge
across it increase, because further away.
400
18
What is noble gases
400
Alkali metals
What is soft silvery, react with water and air, stored under oil or keosene. VERY ACTIVE.
400
charged particles
What is ions
500
17
What is halogens
500
alkaline earth metal
What is less reactive and harder and denser than group 1