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Similarities:
- They both appear in the periodic table
- Both can react to other elements
- Both have protons, neutrons, and electrons

Differences:
- Metals are bendable and malleable while nonmetals are brittle
- Metals conduct electricity well meanwhile nonmetals are bad conductors
- Metals have high melting points but non-metals have low melting points
- Nonmetals are often liquids

https://sciencenotes.org/metals-vs-nonmetals/

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similar physical properties.

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The alkali metals are lithium, potassium, sodium, rubidium, caesium, and francium. They are in a group of chemical elements from the s-block in the periodic table.

These elemets are shiny, slivery and soft as their physical properties.

They are highly reactive at standard temperature and pressure and readilt to lose their valence electrons to form cations with a positively charged ion.

Alkali metals are highly reactive towards water, halogens and acids and then release amounts of heat and light.

https://courses.lumenlearning.com/introchem/chapter/the-alkali-metals/

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The second column from the right in the periodic table. All halogens are non-metals and are called halogens because they all produce sodium salts.

Some examples of elements that are halogens are fluorine, chlorine, bromine, and iodine.

Halogens have 7 valence electrons meaning that they are the most reactive elements. And so because of that, they aren't found very easily in the earth's crust.

"Halogen." Britannica School, Encyclopædia Britannica, 23 Oct. 2020. school.ebonline.com/levels/high/article/halogen/110612. Accessed 9 Apr. 2021.

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The noble gases are the whole of the most right column in the periodic table. The 6 noble gases are Helium, Neon, Argon, Krypton, Xenon, and Radon.

These elements have a full valence shell, making them very inert and not reactive. The 7 noble gases have extremely similar  physical properties, with the melting and boiling points differing by less than 10˚C. The noble gases are also used in excimer lasers, which are based on short-lived electronically excited molecules known as excimers. The excimers used for lasers may be noble gas dimers such as Ar₂, Kr₂, or Xe₂, or, more commonly, the noble gas is combined with a halogen in excimers such as ArF, KrF, XeF, or XeCl.

The noble gases are commonly used to make neon lights that shine different colors.

https://courses.lumenlearning.com/introchem/chapter/the-noble-gases-group-18/