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Number of Elements in a Period

Consider the ...

Question

Consider the following elements : Be, Li, Na, Ca, K.Name the elements of (a) same group (b) same period.

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Solution

(a) Same IA group (Li, Na, K) and IIA group (Be, Ca)
(b) In the second period (Be, Li) and in the fourth period (K, Ca)

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Question 29
Can the following groups of elements be classified as Dobereiner’s triad?

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(b) Be, Mg, Ca

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Q. Find the number of element( s) which is/are present in group-I :
Be, Li, Mg, AI, Na, Ca, Cs

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Number of Elements in a Period

Standard X Chemistry

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