Classification Of Elements — Chemistry

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Question 1
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Element showing variable valency:

A. Fe\mathrm{Fe}
B. Na\mathrm{Na}
C. Mg\mathrm{Mg}
D. Al\mathrm{Al}
Question 2
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Number of valenceelectronsinhalogenvalence electrons in halogen is:

A. 7
B. 1
C. 2
D. 5
Question 3
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Element with atomic number 26 is in which period?

A. 4
B. 3
C. 5
D. 6

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