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Evaluation of a Determinant

Explain the f...

Question

Explain the following:
(c) An element has atoms with different mass numbers.

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Solution

Two or more atoms of the same element may contain the same number of protons but they may differ in number of neutrons.
Therefore, an element has atoms with different mass numbers and they are called isotopes.
Isotopes are atoms with different mass numbers which have the same atomic number.
For example: Uranium- $235$ and uranium- $238$ are two isotopes of uranium.

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Similar questions

(a) What is meant by (i) atomic number, and (ii) mass number, of an element? Explain with the help of an example.

(b) What is the relation between the atomic number and mass number of an element?

(c) If an element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?

Explain the following :

(a) Electrovalent compounds conduct electricity in molten or aqueous state.

(b) Electrovalent compounds have a high melting point and boiling point while covalent compounds have low melting and boiling points.

(c) Mass of an atom is concentrated inside the nucleus of an atom.

(d) Atoms combine by transfer and sharing of electrons (s).

(e) An element has atoms with different mass number.

Name or state the following :

(a) An element having valency zero.

(b) Metal with valency one.

(c) Atoms of the same element differing in mass numbers.

(d) Elements having same mass number but different atomic number.

(e) Bond formed by transfer of electron(s).

(f) Ion formed by gain of electron(s).

Q. Complete the following statements :

(a) Magnesium has 2 valence electrons in the ............. shell.

(b) The valency of nitrogen in N₂ molecule is .............

(c) Isotopes have different mass numbers because their nuclei contain different number of .............

(d) Some boron atoms have mass number 10 and some have mass number 11. These boron atoms with different mass numbers are called .............

Complete the following statements :

(a) Magnesium has 2 valence electrons in the ___ shell.

(b) The valency of nitrogen in $N_{2}$ molecule is ___

(c) Isotopes have different mass numbers because their nuclei contain different number of ___

(d) Some boron atoms have mass number 10 and some have mass number 11. These boron atoms with different mass numbers are called ___

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Evaluation of a Determinant

Standard XII Mathematics

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