Halogens are so reactive because they have 7 valence electrons and are very close to having a complete shell of 8 electrons. The Halogens - Reactions with Metals. Chemical Reaction Images Chemical Reactions Chemistry Lessons Science Chemistry Law Of Multiple Proportions Why does Group 7 get less reactive. . Reactivity decreases down the group. The noble gases have filled valence shells as they occur in nature. 2K H 2 SO 4 K 2 SO 4 H 2. Exposing an alkali metal to a halogen will cause an extremely exothermic reaction that results in an ionic salt. Because they have only one valence electron group 1 elements are highly reactive. Group 1 metals - see the reaction with alkali metals. In this way why is Group One called alkali metals. It is this electrostatic attraction that forms ionic bonds in metal halides and other ionic compounds. The halogens are reactive non-metals. The group 1 of the pe...
It involves different types of barriers. Active immunity is created by our own immune system when we are exposed to a potential disease-causing agent ie pathogen. Acquired Immunity Passive immunity is acquired when antibodies are introduced into the body from an external source usually through vaccines. . Acquired active Immunity occurs when your body becomes immune to disease after getting vaccinated or exposed to what will become an infection in the future. Let us break down the different types of acquired immunity. Antibody response after vaccination. Active immunity and passive immunity. Medical Definition of active immunity. There are two types of immunity. Active immunity can be acquired through natural immunity or vaccine-induced immunity. Adaptive immunity is divided into two categories. The antigens present on the surface of the pathogens act as markers that bind to the antibodies. ...
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