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Chemistry - 9 Chapter - 3
Atomic Structure
Test - 19
1.
What is artificial radioactivity?
a) Artificial radioactivity takes place when a non-radio active element is converted to radioactive element by bombarding it with alpha particles.
b) Artificial radioactivity takes place when a non-radio active element is converted to radioactive element by bombarding it with gamma particles.
2.
Define quantum (number)?
a) Quantum is the unit of energy which is emitted or absorbed when an electron jumps from one orbit to the other.
b) Quantum is the unit of energy which is emitted or absorbed when an electron jumps from one atom to the other.
3.
Define shell?
a) Shells are different energy levels around the regulars of an atom. Each shell contain one or more sub shells represented as s, p, d and f with max number of electrons as 2,6,10 and 14.
b) Shells are different energy levels around the regulars of an atom. Each shell contain one or more sub shells represented as s, p, d and f with max number of electrons as 3,9,12 and 16.
4.
Why the charge on nucleus of an atom is positive?
a) Due to negatively charged protons present in the nucleus.
b) Due to positively charged protons present in the nucleus.
5.
Why atom as a whole is neutral?
a) Number of protons and electrons in an atom is equal. Protons inside nucleus are positively charged and electrons out side nucleus have negative charge. This makes the atom as a whole neutral.
b) Number of protons and electrons in an atom is equal. Protons inside nucleus are positively charged and electrons out side nucleus have negative charge. This makes the atom as a whole positive.
6.
Define Isotopes?
a) Atoms of an element having same atomic number but different atomic mass (Mass Number).
b) Atoms of an element having same atomic number but different atomic mass (atomic Number).
7.
Why different isotopes show same chemical properties but different physical properties?
a) Same chemical properties because their electronic configuration is same different physical properties because mass number (weight) is same.
b) Same chemical properties because their electronic configuration is same different physical properties because mass number (weight) is different.
8.
What do you understand by physical properties?
a) It means weight, colour, smell, atomic number, appearance etc.
b) It means weight, colour, appearance etc.
9.
How isotopes of elements are represented?
a) Atomic mass is written on upper left side and atomic number on bottom left side of the element symbol i.e. 12/6C, 13/6C, 14/6C ( 12/6C means 12 on upper left side of C and 6 on lower right side of C )
b) Atomic mass is written on upper left side and atomic number on bottom left side of the element symbol i.e. 12/6C, 13/6C, 14/6C ( 12/6C means 12 on upper left side of C and 6 on lower left side of C )
10.
Show isotopes of Hydrogen and oxygen diagrammatically. Remember from Page 56 & 57
a) I will learn the answer by heart
b) I know the answer by heart
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