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Chemistry

The alkali metal in period 2 and the halogen in period 3.

Periodic Table

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Answer

Lithium, chlorine.

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Related Questions

Complete the table of trends in periodic properties by -
(a) Filling in the blanks with 'decreases' or 'increases' across a period & down a group.
(b) The reasons for the 'decrease' or 'increase' based on the criteria given.
Trend Reason for trend
Periodic property Across a period Down a group in periodic property
(a) Atomic size No. of shells • Nuclear charge
(b) Ionization potential Increases Atomic size • Nuclear charge
(c) Electron affinity Atomic size • Nuclear charge
(d) Electronegativity Decreases Atomic size • Nuclear charge
(e) Metallic character Atomic size • Ionisation potential