Consider the following elements:

Ca, Cl, Na, I, Li, Ba, Sr, K, Br
Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.

• Lithium (Li), sodium (Na), and potassium (K) are the metals belonging to group 1 having a valency of 1.
• Calcium (Ca), strontium (Sr), and barium (Ba) are the metals belonging to group 2 having a valency of 2.
• Chlorine (Cl), bromine(Br), and iodine (I) are the halogens belonging to group 17 having a valency of 7.

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Updated on: 10-Oct-2022

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