![]() along the periodic table.Atomic mass of all elements (along with the rounded off values) is mentioned in the chart below. Note: In order to solve these kinds of questions, you must memorize the trend of metallic character, electronegativity, atomic size, atomic radius etc. Therefore, cesium (Cs) is larger in size than barium (Ba). This is because each atom further down the column has more protons and neutrons and also gains an additional electron energy shell. As you move down an element group (column), the size of atoms increases. Like the other metals in this group, it readily loses these electrons to form a $B$.Īnswer (v)- The size of neutral atoms is drawn from the atomic radius, which is half the distance between two atoms which are just touching each other. ![]() Therefore, Ba is less reactive than Cs.Īnswer (iii)- Barium (Ba) is an alkaline earth metal that has 2 outer shells. ![]() For metals reactivity decreases as you go from left to right across a period and reactivity increases as you go down a group. This is usually determined by how easily electrons can be removed and how badly they want to take other atom's electrons (electronegativity) because it is the transfer of electrons that is the basis of chemical reactions. Therefore, barium (Ba) is a metal.Īnswer (ii)- Reactivity refers to how likely or vigorously an atom reacts with other substances. It is irrelevant with going along a period in a periodic table. The metallic character increases as we go down a group. Metals tend to lose electrons in chemical reactions due to their low ionization energies. Let's discuss each question one by one and find their answers:Īnswer (i)- Metallic character implies the level of reactivity of a metal. ![]() This question can be solved with reference to the position of the barium. ![]() It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Hint: Barium is a chemical element (symbol Ba) with atomic number 56. ![]()
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