This element has an atomic number lower than that of aluminum and one less valence electron than the group 16 elements _____ This element is in group 1 and has a high atomic number than chlorine, but a lower atomic number than bromine. alkali metals. Alkaline earth metals appear shiny, silvery-white and are found in the earth's crust. This gives alkaline earth metals the largest atomic radii in their periods. These metals are somewhat reactive at standard conditions. Some characteristics of alkaline earth metals are: An oxidation number of +2 which makes them very reactive. Group 1: Group 2: Groups 17: Alkali Metals Halogens Alkaline Earth Metals Groups 18: Noble Gases Transition Metals Groups 3-12: CHEMICAL FAMILIES ON THE PERIODIC TABLE Is a group (column) that contains elements with similar _____. All the alkaline earth metals have two electrons in their valence shell, so they lose two electrons to form cations with a 2+ charge. All the discovered alkaline earth metals occur in nature. How reactive are alkali metals? Beryllium sulphate is readily soluble in water. Atomic Number: 4 Atomic Mass: 9.0 Number of Protons/Electrons: 4 Number of Neutrons: 5 Classification: Alkaline Earth Metals Discovery: 1798 Discoverer: Fredrich … They are ready to give up those two electrons in electrovalent (ionic) bonds. Together with hydrogen they constitute group 1, which lies in the s-block of the periodic table.All alkali metals have their outermost electron in an s-orbital: this shared electron configuration results in their having very similar characteristic properties. The alkaline earth metals are in the second group of the periodic table. TWO. ... is ten less than their group number. Atomic radius increases down the group Mg–Ba Explanation: the number of shells of electrons increases in each element as the group is descended. The alkali metals consist of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr). 2 types of metals. Each alkaline earth metal atom has two valence electrons in its outermost shell (s-orbital). All alkaline earth metals are placed under group number 2 and s-block of periodic table. Reactions of Alkaline Earth Metals. Oxides of all other alkaline earth metals are basic in nature. 5. Distributed in rock structure. which elements is special about it's valence electron number in groups 13-18. Not found freely in nature. This group of elements includes beryllium, magnesium, calcium, strontium, barium, and radium.The elements of this group are quite similar in their physical and chemical properties. very reactive. Sulphates of other alkaline earth metals (Except magnesium) possess less solubility in water than BeSO 4. Other alkaline earth metals exhibit coordination number up to six. This group lies in the s-block of the periodic table. The elements in Group 2 are called the alkaline earth metals. all elements in group 1 except hydrogen. The group number is the same as the number of valence electrons except in the transition metals . The elements in Group 2 are called the alkaline earth metals. The alkaline earth metals comprise the group 2 elements. Be does not possess coordination number more than four. First ionisation energy decreases down the group Mg–Ba Explanation: the distance between the nucleus and the outermost valence electrons is increased… Alkaline-earth metals: The alkaline-earth metals make up Group 2 of the periodic table, from beryllium (Be) through radium (Ra). Present in the earth's crust but not in their basic form. The alkaline earth metals are the elements that correspond to group 2 of the modern periodic table. helium. alkaline earth metals. alkali metals and alkaline earth metals. Alkaline Earth Metals. 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