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The elements of the 1st GROUP of the Periodic Table are called alkali metals.
The elements of the 17th GROUP of the periodic table are called halogens.
Alkali metals are soft metals whereas halogens are non-metals.
If you mix an neutral and an acid, The pH of the solution will be closer to 7 (neutral).Also if you mix an acid with an alkali (providing they are around the same strengh) it will turn neutral. Its like mixing orange juice with water, The juice is acid and the water is neutral, put water in the juice and it become weaker.