How To Predict Properties Of Elements Using Groups Periods Step 1: identify the 'group number' of the given element in the periodic table. the group number of an element is the same as the number of electrons in its outer shell. the number of electrons in. Halogens. halogens are comprised of the five nonmetal elements flourine, chlorine, bromine, iodine, and astatine. they are located on group 17 of the periodic table and have a charge of 1. the term "halogen" means "salt former" and compounds that contain one of the halogens are salts.
How To Predict Properties Of Elements Using Groups Periods Group 1 elements. the group 1 elements are called the alkali metals. they include lithium, sodium and potassium, and are placed in the first vertical column on the left of the periodic table. all. Atomic size trends: the distance between the centre of the nucleus and the outermost shell of an atom is known as the atomic radius. in a group the atomic size increases due to the addition of shells as we move from one period to another. across a period the atomic size decreases as the number of shells remain the same while the nuclear charge. Atomic radius: atomic radius is a term describing the distance between an atom’s nucleus, and its outermost electron shell. several factors affect this distance; including the number of an element, and the number of electron shells. through periodic trends, the atomic radius increases in size further left of a period, and lower down a group. Periodic trends, arising from the arrangement of the periodic table, provide chemists with an invaluable tool to quickly predict an element's properties. these trends exist because of the similar atomic structure of the elements within their respective group families or periods, and because of the periodic nature of the elements.
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