Question
Define isotopes giving examples. State three properties of isotopes.

Answer

Isotopes: Elements having the same atomic number but the different mass numbers are isotopes of each other. Both forms of the element have the same number of protons. Number of neutrons is different in isotopes.
Example: ${ }_7 N^{14}$ and ${ }_7 N^{15}$
State three Properties of Isotopes are-
1. Isotopes have similar chemical properties, but different, physical properties like mass, weight etc.
2. Isotopes occupy the same position in the periodic table.
3. Atomic mass vary due to change in number of neutrons.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

What is inter$-$conversion of matter. Give the meaning of the terms involved in inter$-$conversion of matter $–$
$(a)$ Melting
$(b)$ Vaporisation
$(c)$ Liquefaction or condensation
$(d)$ Solidification or freezing
$(e)$ Sublimation.
Write the number of (a) protons, (b) neutrons, (c) electrons is case of following atoms :
(iii) Fluorine $\left[{ }_9 F^{19}\right]$
With reference to the uses of hydrogen, give reasons for the following :
$(a)$ Hydrogen is not used in air balloons
$(b)$ A mixture of hydrogen $\&$ oxygen on burning, find application in welding $\&$ cutting metals
$(c)$ Reaction of hydrogen with nitrogen under specific conditions finds industrial utility.
How can you separate the components of mixture of common salt (NaCl) and marble powder (CaCo3)? Mention the principle involved in it.
State the reasons for $(a)$ Use of diamond $–$ as an item of jewellery, $(b)$ Use of graphite $–$
$(i)$ as a lubricant for heated machine parts
$(ii)$ as a lining for crucibles used in manufacture of high grade steel
$(iii)$ as an electrode in electroplating.
Draw a table to differentiate $–$ True solutions, colloidal solutions $\&$ suspensions with respect to $–$
$(i)$ Type of mixture
$(ii)$ Solute particles in the mixture.
How would you show that hydrogen is lighter than air?
State any three conclusions regarding the nucleus of an atom.
What is a fire extinguisher ? What is the substance used in the modern type of fire extinguishers ? How is it an improvement over the soda acid$-$type and the foam$-$type fire extinguishers ?
Give one example each of $–$
$(a)$ A peroxide
$(b)$ A mixed oxide
$(c)$ A dioxide.