Make a chart which shows the name of the element, valency, atomic number, electronic configuration in the 2nd row of the modern periodic table and arrange these elements in ascending order of atomic mass. The number of shells decreases in a group from top to bottom.īoron and oxygen elements are placed in the second period in periodic table. The elements lithium and beryllium are in the same period because their valencies are similar.īeryllium and calcium are alkaline earth metals. But, in a physical change, the chemical identity of matter does not change. In contrast, matter also changes form via physical changes. View Lab - Trends in Chemical Reactivity on the Periodic Table from CHEMISTRY 11U at St David Catholic Secondary School. The number of electrons in the outermost shell of an atom determines the _. A chemical reaction is a chemical change, which means the starting materials are chemically different from the ending materials. Which among the following elements would lose an electron easily? Which pair of atomic numbers represents elements in the same group? You will determine the trend of chemical reactivity of metals as you move down a group and across a period on the periodic table. What is the atomic number of this element? Which of this element belong to the period 3? Write their electronic configurationĪn element has its electron configuration as 2, 8, 2. Unit 1: Structures, Trends, Chemical Reactions, Quantitative Chemistry and Analysis 1.6 The Periodic Table 1.6. Answer the following question with explanation.ĤBe, 6C, 8O, 5B, 13Al Which is the most electropositive element among these?ġ9K, 3Li, 11Na, 4Be Which of these atoms has smallest atomic radius?ĦC, 3Li, 9F, 7N, 8O Which of the above elements has the highest nonmetallic character?

Write down the electronic configuration of the following elements from the given atomic numbers.

Periodic table chemical reactivity