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Anomalous Expansion of Water

Find the two ...

Question

Find the two elements out of Boron, Carbon, Nitrogen and Oxygen which have same number of neutrons in their atoms.

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Q. Two atoms of the same element are found to have different number of neutrons in their nuclei. These two atoms are :

Q. An element is represented by

_{Z} X^{A}

, where Z is atomic number which is also equal to number of proton, A is mass number and X is symbol of the element.
Mass number (A) = Number of protons (Z) + Number of neutrons.
Isotopes: Atoms having same number of proton
Isobar: Elements having same mass number
Isotones: Elements having same number of neutron (A-Z)

The sum of the number of electrons, protons and neutrons in the three isotopes

(^{16} O,^{17} O,^{18} O)

Q. Question 11
In a sample of ethyl ethanoate

(C H_{3} C O O C_{2} H_{5})

the two oxygen atoms have the same number of electrons but different number of neutrons; which of the following is the correct reason for it?

(a) One of the oxygen atoms has gained electrons
(b) One of the oxygen atoms has gained two neutrons
(c) The two oxygen atoms are isotopes
(d) The two oxygen atoms are isobars.

Q. The atoms of different elements having the same number of neutrons are known as :

Q. A and B are two elements which have same atomic weight and are having atomic number 27 and 30 respectively. If the atomic weight of A is 57 then number of neutron in B is :

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Anomalous Expansion of Water

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