Question

(1)Given below are some elements of the modern periodic table:

4Be , 9Fe , 14Si , 19K , 20Ca

i) select two elements that belong to the same group. Give reason.

ii) select two elements that belong to the same period. Which one of the two has bigger atomic size?

Answer 1

Be and ca are in the same group
k and ca are in the same period
Be has bigger atomic size.
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Answer 2

Explanation:

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