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Groups in Modern Periodic Table

Name the elem...

Question

Name the element which is in :

(a) the first group and third period. (b) seventeenth group and second period.

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Solution

(a) Sodium (Na) is the element which is in the first group and the third period.

(b) Fluorine (F) is the element which is in the seventeenth group and the second period.

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Q. Name the element which is in:

(a) first group and third period.
(b) seventeenth group and second period.

The number of oscillations per second is called the Time Peroid of oscillation

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Q. The combined mean of three groups is

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and the combined mean of first two groups is

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. If the first, second and third group have their mean as

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times respectively, then the mean of third group is

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