![]() The resulting solution of this reaction is a weak alkaline – not as strongly alkaline as the one produced by the reaction between sodium and water. It is a very slow reaction at room temperature. Magnesium reacts less violently and less rapidly than sodium. The resulting solution is a very strongly alkaline solution of sodium hydroxide, this has a pH of about 13-14. ![]() The sodium will fizz and float on the surface of the water as it reacts. Sodium reacts with water in a rapid and violent reaction. ![]() The only metal elements in period 3 that will react with cold water are sodium and magnesium. Sodium (Group 1) has 1 outer electron in the third outer shell. The group number tells you the number of electrons in the outermost shell – e.g. The period number tells you the number of shells – e.g. Period 3 elements are in the third row of the periodic table. Properties of Period 3 Elements - Reactivity of Period 3 Elements (A-Level Chemistry) Reactivity of Period 3 Elements Period 3 Elements Chemistry Teacher Resource Edexcel | AQA | OCR.Biology Teacher Resource Edexcel | AQA | OCR | CIE.Booking A-Levels as a Private Candidate.Chemistry Flashcards Edexcel | AQA | OCR | CIE.Biology Flashcards Edexcel | AQA | OCR | CIE.Chemistry Textbook Edexcel | AQA | OCR | CIE.Biology Textbook Edexcel | AQA | OCR | CIE.Physics Weekly Classes Edexcel | AQA | OCR | CIE.Chemistry Weekly Classes Edexcel | AQA | OCR | CIE.Biology Weekly Classes Edexcel | AQA | OCR | CIE.GCSE Physics Flashcards Edexcel | AQA | OCR | CIE.Physics Online Course Edexcel | AQA | OCR | CIE.Chemistry Online Course Edexcel | AQA | OCR | CIE.Biology Online Course Edexcel | AQA | OCR | CIE.Physics Tutor Edexcel | AQA | OCR | CIE.Henrietta Barnett School Admissions Tutors.James Allen’s Girls’ School Admissions Tutors.King’s College Wimbledon School Admissions Tutors.Lycee Francais Charles de Gaulle School Admissions Tutors.Radley College School Admissions Tutors.
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