______________ react with water to form strong alkalies.
Halogens
Noble gases
Boron
Alkali metals
Elements in the sixth period from cerium to lutetium are known as
Lanthanides
_______________ is the distance between the centre of the nucleus and the outermost shell.
Ionisation potential
Atomic radius
Electron affinity
Electronegativity
__________________ lie at the centre of the periodic table between metals on the left and non-metals on the right.
Alkaline earth metals
Transition elements
_______________ are weak metals and metalloids.
Post transition elements
Inner transition elements
_____________ are good oxidising agents.
_______________including alkali metals and alkaline earth metal are in the extreme left of the periodic table.
Metals
Non-metals
Metalloids
Insulators
Each period begins with an element having _______________ electron in the outermost shell.
1
3
5
7
________arranged elements in increasing order of atomic weights in series of eight.
Newland
Dobereiner
Mendeleev
Moseley