78.1. THE PERIODIC TABLE 元素周期表 (图片可点击放大) In this section, we will explore the periodic table, which organizes chemical elements and provides valuable information about their properties and relationships. Understanding the periodic ...
The Periodic Table was invented byDmitri Mendeleevin 1869, who was the first scientist to put elements in order of atomic mass. Mendeleev was so clever at spotting patterns he left gaps for undiscovered elements. The modern periodic table is slightly different to the one created by Mendeleev as...
This chapter discusses the intermetallic reactivity trends in the periodic table. The general alloying characteristics of the different metals, their reactivity toward the other metals, the variety of their intermetallic derivatives usually are very complex and cannot be easily explained and rationalized ...
If you don't have the chart of the activity series handy, you can also use trends in the periodic table to predict the reactivity of a metal or nonmetal. The most reactive metals belong to thealkali metalselement group. Reactivity increases as you move down the alkali metals group. The in...
22 Reactivity Example: Sodium (group 1) easily gives up an electron, since it exposes the full valence shell underneath Example: Fluorine (group 17) readily gains an electron, since it completes their valence shell 23 Concept 3: The periodic table shows how properties of elements change in pre...
Part of the Periodic Table is shown in Fig. 6.1.The letters are not the actual chemical symbol of the elements.V XY WZ Fig.6.1For each of the following statements, decide whether the statement is true or false and state a reason for your decision.(a) W is more metallic than Z.(b)...
A3The table shows how elements in Group ll of the Periodic Table react with cold water.element reaction with cold water magnesium reacts slowly with cold water calcium reacts readily with cold water strontium reacts vigorously with cold water barium reacts very vigorously with cold water radium(...
ButGuillermo Restrepoat the Max Planck Institute for Mathematics in the Sciences, Germany, favours an alternative. He has explored whether chemical similarity of elements in the same columns still holds as well as it did 150 years ago, given our increased knowledge of chemical reactivity. Hi...
(iii)Francium will explode with water as the reactivity increases down Group 1. 2Fr + 2H2O ? 2FrOH + H2 The pH level will be about 13 as FrOH will be an alkali like sodium hydroxide. Applying what you have learnt …. Complete the table below by predicting the formula of Group 1 ...
Periodic table PART 2 – QuestionIT What happens to the reactivity of the elements as you go down Group 1? Write a word equation for the reaction between sodium and oxygen. Why do all the elements in Group 7 react in a similar way to each other? Halogens are diatomic. What does the ...