Question

13) Hydrogen has three isotopes (A), (B) and (C). If the number of
neutron(s) in (A), (B) and (C) respectively, are (x), (y) and (3),
the sum of (x), (y) an (z) is :
(1) 4
(2) 3
(3) 2
(4) 1​

Answer 1

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✒ Given:

✏ Hydrogen has three isotopes A,B and C

✏ No. of neutron(s) in A,B and C are respectively X,Y and Z.

✒ To Find:

✏ The sum of X,Y and Z.

✒ Isotopes of Hydrogen:

✏ Hydrogen has three main isotopes. Name of them are given below

1. Hydrogen-1
2. Deuterium
3. Tritium

✨ Hydrogen-1 :

✏ Hydrogen-1 has one proton in nucleus.

✏ It has not a single neutron in nucleus.

✏ X = 0

✨ Deuterium :

✏ Deuterium has one proton and one neutron in nucleus.

✏ Y = 1

✨ Tritium :

✏ Tritium has one proton and two neutrons in nucleus.

✏ Z = 2

✒ X + Y + Z = 0 + 1 + 2 = 3