Page 4 - 3.HOME ASSIGNMENT-CONCEPT MAP

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Q5 The number of neutrons present in an element with the symbol 17X ? 1
(a) 17
(b) 18
(c) 20
(d) 19

Q6 N shell can accommodate maximum 18 electrons.(T/F) 1

Concept: Isotopes and Isobars.

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Q1. Assertion: 6X and 6X are isobars 1
Reason: Isobars have same atomic number.
Q2 Assertion: Protium and deuterium are isotopes. 1
Reason: They have same number of neutrons.
Q3 Which of the following pairs are isotopes? 1
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(a) 12X , 12Y
(b) 6X , 7Y
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(c) 15X , 16Y
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(d) 20X ,18Y
Q4 Which of the following element is used as a fuel in nuclear reactors? 1
(a) Uranium
(b) Calcium
(c) Iodine
(d) Cobalt
Q5 6C and 6C are isotopes because they have same number of ------- and 1
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different number of ………
Q6 Isotope of iodine is used in treatment of cancer. (T/F) 1