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Gre4nikov [31]
3 years ago
10

What is the criteria to place an element in a particular group?

Chemistry
1 answer:
emmainna [20.7K]3 years ago
4 0

Answer: The criteria to place elements into groups and periods lies in their atomic number

Explanation:

As we know that period is the horizontal rows of elements in the periodic table and groups are vertical column of elements in the periodic table.

In a period we place those elements that have same number of shells and in a group those elements are placed that have different number of shells and the number of shells increases from top to bottom in a periodic table

For example

Sodium having symbol Na, atomic number of sodium is eleven it's electronic configuration is 1s2,2s2,2p6,3s1, next to it in a period is places potassium having symbol,K, it's electronic configuration is 1s2,2s2,2p6,3s2.

Sodium and potassium both r placed in a period not in a group because both of these have same outer most shell, only the number of electron in outer most shell varies.

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Ea=5.5 Kcal/mole

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