Topic- Structure of the Atom

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Topic- Structure of the Atom
Topic- Structure of the Atom
Level-1
Answer the following questions1) If number of electron in an atom is 8 and number of proton is also 8, then (i) what is the
atomic number of the atom? (ii) What is the charge on the atom?
2)
3) If an atom loses an electron, it becomes
(i)
a positive ion
(ii)
a negative ion
(iii)
neutral
4) Why does the proton determine the identity of an atom?
(i) The number of protons is also the atomic mass
(ii). The number of protons determines chemical properties, such as reactivity.
(iii)
(iv)
The number of protons in an atom's nucleus determines an atom's atomic
number.
The number of protons decides an atom's name.
5) When an atom is chemically stable, how many electrons are in its outer energy level?
(i)
(ii)
(iii)
(iv)
8
7
4
1
Level-2
1. If K and L shells of an atom are full, then what would be the total number of electrons in
the atom?
2. What is unique about the number of neutrons in a normal hydrogen atom?
a. it does not have any neutrons
b. it has more neutrons than protons
c. it has an equal number of neutrons and protons
d. it has an equal number of neutrons and electrons
3. The diagram represent Rutherford's Gold Foil experiment. Which statement is a conclusion
that came from this experiment?
a.
b.
c.
d.
electrons orbit the nucleus in rings at set distances
the nucleus of an atom is made of protons and neutrons
the probable location of electrons can be predicted using a cloud model
most of an atom is empty space and its mass is concentrated in its center
4. In an element with a neutral charge, the atomic number is equal to the number of:
i. Atoms
ii.
iii.
iv.
v.
nucleus
protons
electrons
both iii and iv are correct
5. Isotopes are atoms of the same element with the same number of protons and
i. different number of electrons
ii.
a different number of molecules
iii. a different number of neutrons
iv.
the same number of neutrons
Level-3
1) Composition of the nuclei of the two atomic species X and Y are given as underX
Proton
=
Neutrons =
Y
6
6
6
8
Find the mass numbers of X and Y. What is the relation between the two species?
2) Kayla draws the image shown below as part of her physical science homework.
What did Kayla draw?
1. Bohr model
2. Lewis symbol
3. Molecular formula
4. Structural formula
3) Draw the atomic structure of (i) an atom with same number of sub-atomic particles, (ii) an atom
with same number of electrons in L and M shell.
4) What are nucleons? What is the name given to those atoms which have same number of
nucleons in it?
5) The atomic number of chlorine is 17 and one of its isotopes contains 20 neutrons. How
will you represent the isotope?

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