Answer and Explanation: With an atomic number of 88 and an atomic mass of 226, radium is the largest of the alkaline earth metals. Eighty-eight protons and 138 neutrons are See full answer below.
Are alkaline earth metals highly metallic?
The alkaline-earth elements are highly metallic and are good conductors of electricity. They have a gray-white lustre when freshly cut but tarnish readily in air, particularly the heavier members of the group. Beryllium is sufficiently hard to scratch glass, but barium is only slightly harder than lead.
Is RA the most reactive alkaline earth metal?
Group 2A (or IIA) of the periodic table are the alkaline earth metals: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). They are harder and less reactive than the alkali metals of Group 1A.
What element is the largest alkali metal listed?
Of the 5 non-radioactive alkali metals, cesium has the lowest melting and boiling point, the highest density, the largest atomic radius, and the highest reactivity. It has the lowest electronegativity and the lowest first ionization energy.
Is polonium a post transition metal?
Typically the elements of the post-transition metals include any metal in groups 13, 14, and 15 which are aluminum, gallium, indium, tin, thallium, lead, and bismuth. Polonium is often classified as a post-transition metal as well.
What is most similar about alkaline earth metals?
All alkaline Earth metals have similar properties because they all have two valence electrons. They readily give up their two valence electrons to achieve a full outer energy level, which is the most stable arrangement of electrons.
Are alkaline earth metals metals nonmetals or metalloids?
Hydrogen is group 1 but exhibits few characteristics of a metal and is often categorized with the nonmetals. Alkaline earth metals. The alkaline earth metals make up group 2 of the periodic table, from Be through Ra. The alkaline earth metals have very high melting points and oxides that have basic alkaline solutions.
Is lithium alkaline earth metal?
The elements in group one of the periodic table (with the exception of hydrogen – see below) are known as the alkali metals because they form alkaline solutions when they react with water. This group includes the elements lithium, sodium, potassium, rubidium, caesium and francium.
What is the 2nd most reactive metal?
The alkaline earth metals are the second most reactive family of elements. Beryllium, magnesium, calcium, strontium, barium and radium are all shiny, and silvery-white.
What is the most reactive alkaline?
The reactivity of alkali metals increases from the top to the bottom of the group, so lithium (Li) is the least reactive alkali metal and francium (Fr) is the most reactive.
What element is the 2nd most reactive metal?
rubidium (Rb), chemical element of Group 1 (Ia) in the periodic table, the alkali metal group. Rubidium is the second most reactive metal and is very soft, with a silvery-white lustre.
What is the largest alkali metal symbol?
francium (Fr), heaviest chemical element of Group 1 (Ia) in the periodic table, the alkali metal group.
What is the alkaline earth metal with the largest atomic number?
Radium, the heaviest – with an atomic number of 88 – was discovered by Marie and Pierre Curie in 1898 and is the only radioactive member of these metals.
What is the smallest alkaline earth metal?
Beryllium (Be), the smallest alkaline earth metal, is atomic number 4 on the periodic table, has an atomic weight of 9.01 amu (atomic mass unit), and melting and boiling points of 2,348.6°F (1,287°C) and about 4,479.8°F (2,471°C), respectively.
Are metalloids reactive?
The reactivity of the metalloids depends on the element with which they are reacting. For example, boron acts as a nonmetal when reacting with sodium yet as a metal when reacting with fluorine. The boiling points, melting points, and densities of the metalloids vary widely.
Is bismuth a post-transition metal?
In the periodic table, the post-transition metals sit between the transition metals on their left, and the metalloids on their right. These metallic elements include aluminium, gallium, indium, tin, thallium, lead, and bismuth.
