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See About the Periodic Table for information on how Group can be used to characterize an element.

Figure 2.27 The periodic table organizes elements with similar properties into groups. For that reason, hydrogen may be shown at the top of both groups, or by itself.

Hydrogen is a unique, nonmetallic element with properties similar to both group 1 and group 17 elements.

Elements within the same group in the periodic table have similar properties because they have the same number of A. The periodic law states that elements that have similar properties appear A. The ionization enthalpies keep on decreasing regularly as we move down a group from one element to the other.

Moving from left to right in a period, the ionization enthalpy increases with atomic number. There is a relationship between the electron configurations of elements and their chemical and physical properties.

The element in Group 4A, period 3, is gallium.

Moving from magnesium to strontium, strontium is in the 5 th period of Group 2. Let's look at the electron configuration for magnesium. According to this, we can say that there are 3 energy levels with 2 electrons in the outermost energy level.

So the element magnesium (Z = 12), is in Period 3, Group 2.

* Information Valid for Most Abundant Isotope Only.Like other groups, the members of this family show patterns in electron configuration, especially in the outermost shells, resulting in trends in chemical behavior. It consists of iron (Fe), ruthenium (Ru), osmium (Os) and hassium (Hs).5.3 Group 2 I II III IV Li Be B C Period 2 Na Mg Al Si Period 3 Increasing electronegativity Increasing electronegativity The untypically large electronegativities of Period 2 elements (caused by their small size) mean that they are in some. 5.3 & 5.4 Group 2 What is the outcome from syllabus? 5. Which of the following is the outermost shell for elements of period 2? (a) K shell (b) L shell (c) M shell (d) N shell An element which is an essential constituent of all organic compounds belongs to (a) group 1 (b) group 14 (c)group 15 (d)group 16 10. 2,8 in the Modern Periodic Table? (a) Group 8 (b) Group 2 (c) Group 18 (d) Group 10 9.