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Standard VIII
Chemistry
Occurences
Which of the ...
Question

Which of the following elements has an isotope that does not have a neutron in its nucleus?


A
Helium
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B
Hydrogen
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C
Beryllium
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D
Magnesium
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Solution

The correct option is B Hydrogen

Out of the following elements only hydrogen has an isotope that has no neutron in its nucleus.

Hydrogen has three isotopes- protium, deuterium, and tritium. Protium does not contain any neutron in its nucleus.

Protium:- It has 1 electron, 1 proton, and 0 neutrons.

Deuterium:- It has 1 electron, 1 proton, and 1 neutron.

Tritium:- It has 1 electron, 1 proton, and 2 neutrons.

Moreover for other elements:-

Helium:- It has 2 electrons, 2 protons, and 2 neutrons.

Beryllium:- It has 4 electrons, 4 protons, and 5 neutrons.

Magnesium:- It has 12 electrons, 12 protons, and 12 neutrons.


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Q. An atom of an element contains 13 electrons. Its nucleus has 14 neutrons. Find out its atomic number and approximate atomic mass. An isotope has atomic mass 2 units higher. What will be the number of protons, neutrons and electrons in the isotope?
Q. Consider the following statements.
(i) All isotopes of an element have the same number of neutrons.
(ii) Only one isotope of an element can be stable and non-radioactive.
(iii) All elements have isotopes.
(iv) All isotopes of Carbon can form chemical compounds with Oxygen-16.
The correct option regarding an isotope is?
Q.

Name the following :

(a) The element which does not contain any neutron m its nucleus.

(b) An element having valency 'zero'.

(c) Metal with valency 2.

(d) Two atoms having the same number of protons and electrons but different number of neutrons.

(e) The shell closest to the nucleus of an atom.

Q.
Isotopes are the atoms of the same element; they have the same atomic number but different mass numbers. Isotopes have a different number of neutrons in their nucleus. If an element exists in two isotopes having atomic masses 'a' and 'b' in the ratio m: n, then average atomic mass will m×a+n×bm+n.
Different isotopes of the same element have the same position in the periodic table. The elements which have single isotope are called monoisotopic elements. Greater is the percentage composition of an isotope, more will be its abundance in nature.

Answer the following questions:

The ratio of the mass of 12C atom to that of an atom of element= X (whose atomicity is four) is 1:9. The molecular mass element X is:
Q. Deuterium is the most common isotope of hydrogen. How many neutrons does it have?
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