Question

what is the physical trend for groups 1 and 7 elements

Answer 1

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♨️ As you go down group 1 (the alkali metals) in the periodic table, the elements get more reactive. As you go up group 7 (the halogens), again the elements get more reactive.

♨️ The melting points and boiling points of the halogens increase going down group 7.

Answer 2

Answer:

General physical properties of Group 1 elements:

• Alkali metals are grey solids with shiny silvery surfaces when freshly cut.
• These surfaces turn dull when exposed to air.

• This is because alkali metals are very reactive. They react rapidly with oxygen and water vapour in the air when exposed.  

The melting points and boiling points of the halogens increase going down group 7, and their colour gets darker. The group 7 elements exist as diatomic molecules .

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