1. Dalton’s Atomic Theory

All __________ is made up of small particles called atoms.

Atoms can not be _____________, ______________ or ____________ into smaller particles.

All atoms of the same element are identical in _________ and ___________, but they are
_________________ in mass and size from the atoms of other elements.

_________________ are created when atoms of different elements ________ _________ and
in definite proportions.
2. Thompson discovered ___________bun model of the atom. According to him, the negatively charged
particles are embedded in the atom which is positively charged.
3. Earnest Rutherford discovered the _________________the tiny dense _____________charged centre
of the atom.
4. Neil Bohr discovered the ______________ surround the nucleus of the atom in specific energy levels
or shells.
5. Name the three subatomic particles.
i).________________
ii).________________
iii)._________________
6. Fill out the following table
Proton
Neutron
Electron
Electric charge
Location in the atom
7. Atomic Number= number of ___________________
8. Atomic mass= Number of ____________+ Number of ________________
9. Ion charge= forms on an _____________when it ____________or ____________an electron.
10. Elements on the left side of periodic table forms _____________ions. Elements on right side of
elements form ________________ ions.
11.
State at room
temperature
appearance
conductivity
Malleability and
ductility
Metals
Non-metals
Metalloids
12. Period: A __________________ row
13. Groups, families or columns= ______________row
14.
i) Group 1: ____________________ metals : have _________________ in its valence shell
Name the elements of group 1:
___________________________________________________________________________
ii). Group 2: ____________________metals: have ___________________in its valance shell
Name the elements of group 2:
_____________________________________________________________________________
iii). Group 17: _________________: have ____________________in its valance shell
_____________________________________________________________________________
iv). Group 18: _________________: have ____________________in its valance shell
_____________________________________________________________________________
v) What do elements in the same family have in common?
______________________________________________________________________________
15. Figure out the atomic number, atomic mass, mass number, number of protons, neutrons and
electrons in the following.
Atom/ion
Atomic
number
Number of
protons
Number of
electrons
Atomic
mass
mass
number
Number of
neutrons
Neon atom
fluorine atom
Fluorine ion
chlorine atom
chlorine ion
potassium
atom
potassium ion
16. Draw the Bohr model diagram of calcium atom, magnesium atom, aluminum ion, iron ion (Fe2+),
Vanadium (V5+) and sulphur ion.