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File No.06/04/21/07/2014
VI CLASS - IIT/N.T.S.E FOUNDATION - OLYMPIAD
ANDHRA PRADESH - TELANGANA
2014-2015 PROGRAM M E
2nd-CHAPTER-SOLUTION
2. ATOMIC STRUCTURE
1.
According to john dalton atoms are indivisible.
2.
According to John Dalton’s theory atoms are similar in atomic number, chemical properties
and mass.
3.
Proton, neutron and electron are subatomic particles.
4.
Electron is a negative charged particle.
5.
The charge present on one neutron is zero.
6.
Hydrogen does not has neutron.
7.
Atoms of an element in the formation of ions fixed number of both protons and netrons.
8.
The smallest unit of any element is called atom.
9.
The atoms of different elements combine with one another to form new substance called
compounds.
10.
According to dalton low atoms possess charge particles.
12.
The atomic number indicates number of protons .
13.
The number of protons present in carbon atom is 6.
14.
The mass of an electron is 9.1 x 10-31kg.
15.
Charge of a proton is + 1.602 x 10-19 coulombs.
16.
Neutron was discovered by james chadwick.
17.
The apple pie pudding model of atom was proposed by J.J.Thomson.
18.
The mass of electron is
19.
The charge of an electron was determined by Millikan.
20.
No.of neutrons = mass number
2014 - 2015
1
times of that of H atom.
1837
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atomic number = 16 - 8 = 8.
CHALLENGER
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CHEMISTRY - CHAPTER SOLUTIONS - 2
File No.06/04/21/07/2014
VI CLASS - IIT/N.T.S.E FOUNDATION - OLYMPIAD
1.
The minimum real charge on any particle which can exist is 1.6 x 10-19 coulomb.
2.
Atomic weight is not a whole number.
3.
Though the three fundamental particles are present in almost all elements one element
hydrogen.
4.
The charge on the atom containing 17 protons, 18 neutrons and 18 electrons in -1.
5.
Heaviest particle is neutron.
6.
The proton is slightly lighter than a neutron.
8.
In C14 isotope the number of neutrons would be 8.
9.
If three neutrons are added to the nuclei of
92.
11.
The atoms of different elements combine with one another to form new substance called
compound which is having no electric charge.
12.
The smallest unit of any element is called atom.
13.
Atomic theory was proposed by john dalton.
14.
The term ‘atom’ was gien by democritus.
15.
The idea of scientist unit of matter was proposed by Maharshi kanada.
16.
Protons are denoted by the symbol
17.
The mass of an electron is 9.11 x 10-31 kg.
18.
- 2015
The mass of an electron in amu is 2014
0.000548.
19.
The mass of proton was calculated as being nearly equal to the mass of an atom of hydrogen.
20.
The no.of electrons present in C2H6 molecule is 18.
U235 the new particle have an atomic number of
92
p1.
+1
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BRAIN TWISTERS
1.
According to Dalton Atoms are indivisible and atoms of same element show same chemical
properties.
2.
According to Dalton matter consists of small indivisible particle called atoms, atoms of same
element are alike and atoms combine atoms combine in small whole numbers to form
compound atoms.
3.
If atom has 8 protons and 10 electrons, then it is 2 units negatively charged. similarly atom
has 16 protons and 14 electrons it is also 2 units negatively charged.
4.
According to Rutherford, Electrons are revolving around the nucleus in elliptical orbits,
Atoms must give continuous spectrum and Electrons revolve around the nucleus like planets
do around the sun.
CHALLENGER
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CHEMISTRY - CHAPTER SOLUTIONS - 2
File No.06/04/21/07/2014
VI CLASS - IIT/N.T.S.E FOUNDATION - OLYMPIAD
5.
Ruther ford’s model of atom is against to maxwell theory and line spectrum of atom.
6.
a) Proton - 1.007272 amu
b) neutron - chadwick, 1.008665 amu
c) Electron - J.J.Thomson
d) no.of neutrons - A-Z
7.
a) John dalton - Atoms of similar elements
b) Sub atomic particles - electrons, protons, neutrons
c) Element is a - pure substance
d) Atoms combine in small whole numbers to form molecules.
8.
a) Combination of atoms - compound
b) Element - Atom
c) Atoms cannot be created - chemical reaction
9.
a) Atomic number - no.of protons
b) Mass number - no.of protons + neutrons
c) A - Z - no.of neutrons.
10.
Atoms are the building blocks of matter this was proposed by Dalton but it is not correct
explanation for assertion.
11.
In neutral atom no.of protons equal to no.of electrons
“Neutron has no electric charge
But reason is not correct explanation
for -assertion.
2014
2015
12.
Atom of an element is neutral. But atom posses charged particles.
13.
According to Dalton, atoms are building blocks of matter and are cannot be broken down.
14.
‘Paramanu’ was given by Democritus .
15.
No.of protons equal to no.of electrons, then atom is neutral.
16.
Matter is male up of small particles called atoms given by maharshi kanada.
17.
The no.of elements with out neutron is one i.e., Hydrogen.
18.
Given Atom has 4 electrons, 5 neutrons and 4 protons 4Be9.
19.
The no.of neutrons present in atom with atomic number is 1 and mass number is 3 is 2.
20.
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O, no.of charged subatomic particles is 8.
CHALLENGER
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CHEMISTRY - CHAPTER SOLUTIONS - 2
File No.06/04/21/07/2014
VI CLASS - IIT/N.T.S.E FOUNDATION - OLYMPIAD
1.
Mullikan’s oil drop experiment is used to find, charge of an electron.
5.
A proton and hydrogen have identical values of mass.
6.
The valence shell is the last shell in all atoms.
7.
The electonic distribution in the Mg atom 2,8,2.
9.
Dalton’s atomic theory successfully explained law of conservation of mass, law of constant
composition and law of multiple proportion.
11.
Elements with valency 1 are either metals or non-metals.
12.
The first model of an atom was given by JJ.Thomson.
13.
An atom with 3 protons and 4 neutrons will have a valency of 1.
14.
The order of density in nucleus is 10-8kg/cc.
15.
Penetration power of protons is Less than electron.
16.
the average distance of an electron in an atom from its nucleus is of the order of 10-10m.
17.
Ratio of masses of proton and electron is 1.8 x 103.
18.
e
ration was determined by J.J.Thomson.
m
19.
The mass of an atom is constituted mainly by neutron and proton.
20.
Na+ ion is isoelectronic with Mg+2.
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2014 - 2015
CHALLENGER
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CHEMISTRY - CHAPTER SOLUTIONS - 2