It reacts readily with oxygen to form calcium oxide (CaO): Calcium reacts with the halogens- fluorine, chlorine, bromine, iodine, and astatine, The halogens are the elements that make up Group 17 (VIIA) of the periodic table. ![]() Do not repeat all of the information contained in your resume.Chemical properties Calcium is a moderately active element. Your letter should immediately indicate what position you are applying for and then give information that demonstrates why you should be considered for the position. The cover letter is usually the first item an employer reads from you.
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