WorksheetsAtomic Structure
Total questions: 10
Worksheet time: 7mins
Molecule of Sulphur dioxide contains how many atoms of oxygen ??
2
3
o
1
A large number of pure substances exists as clusters of _____________.
molecules
atoms
compounds
It is the number of _______________ present within the nucleus, which distinguish atoms of one element from the other element.
electrons
neutrons
protons
the number of electrons is equal to number of ___________.
neutrons
protons
Orbits
nucleons
___________________ force counter-balances the pull of nucleus and hence electrons don't fall into the nucleus. (name the force)
force of cohesion
force of attraction
centrifugal
force of adhesion
The max. number of electrons in the innermost shell is _____________.
4
3
6
2
8
write the mass of an electron :
(a)
which of the following elements have variable valency : (choose 3)
iron
hydrogen
helium
silver
copper
Which is the rule when an element needs to have 8 electrons in its outermost shell to make itself stable ??
(a)
Elements react (a) to form compound.
